6721161654 has 32 divisors (see below), whose sum is σ = 13501707264. Its totient is φ = 2230511360.

The previous prime is 6721161653. The next prime is 6721161661. The reversal of 6721161654 is 4561611276.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721161653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1571539 + ... + 1575809.

It is an arithmetic number, because the mean of its divisors is an integer number (421928352).

Almost surely, 2^6721161654 is an apocalyptic number.

6721161654 is an abundant number, since it is smaller than the sum of its proper divisors (6780545610).

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

6721161654 is a wasteful number, since it uses less digits than its factorization.

6721161654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372.

The product of its digits is 60480, while the sum is 39.

The square root of 6721161654 is about 81982.6911853960. The cubic root of 6721161654 is about 1887.1863225299.

The spelling of 6721161654 in words is "six billion, seven hundred twenty-one million, one hundred sixty-one thousand, six hundred fifty-four".