2178380017836 has 144 divisors (see below), whose sum is σ = 6232306848768. Its totient is φ = 635577667200.

The previous prime is 2178380017823. The next prime is 2178380017837. The reversal of 2178380017836 is 6387100838712.

2178380017836 is a `hidden beast` number, since 2 + 178 + 380 + 0 + 17 + 83 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (2178380017837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1967991 + ... + 2868753.

It is an arithmetic number, because the mean of its divisors is an integer number (43279908672).

Almost surely, 2^{2178380017836} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178380017836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3116153424384).

2178380017836 is an abundant number, since it is smaller than the sum of its proper divisors (4053926830932).

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

2178380017836 is a wasteful number, since it uses less digits than its factorization.

2178380017836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901012 (or 901007 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 2178380017836 in words is "two trillion, one hundred seventy-eight billion, three hundred eighty million, seventeen thousand, eight hundred thirty-six".