3712821861654 has 80 divisors (see below), whose sum is σ = 8358355874880. Its totient is φ = 1231831774080.

The previous prime is 3712821861569. The next prime is 3712821861659. The reversal of 3712821861654 is 4561681282173.

It is a happy number.

3712821861654 is a `hidden beast` number, since 3 + 7 + 1 + 2 + 8 + 2 + 18 + 616 + 5 + 4 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 3712821861654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3712821861659) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 45309832 + ... + 45391700.

It is an arithmetic number, because the mean of its divisors is an integer number (104479448436).

Almost surely, 2^{3712821861654} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3712821861654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4179177937440).

3712821861654 is an abundant number, since it is smaller than the sum of its proper divisors (4645534013226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3712821861654 is a wasteful number, since it uses less digits than its factorization.

3712821861654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83187 (or 83178 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 3712821861654 in words is "three trillion, seven hundred twelve billion, eight hundred twenty-one million, eight hundred sixty-one thousand, six hundred fifty-four".