15649436620 has 12 divisors (see below), whose sum is σ = 32863816944. Its totient is φ = 6259774640.

The previous prime is 15649436591. The next prime is 15649436623. The reversal of 15649436620 is 2663494651.

It is a super-3 number, since 3×15649436620³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15649436623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391235896 + ... + 391235935.

It is an arithmetic number, because the mean of its divisors is an integer number (2738651412).

Almost surely, 2^15649436620 is an apocalyptic number.

15649436620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15649436620 is an abundant number, since it is smaller than the sum of its proper divisors (17214380324).

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

15649436620 is a wasteful number, since it uses less digits than its factorization.

15649436620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782471840 (or 782471838 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 15649436620 in words is "fifteen billion, six hundred forty-nine million, four hundred thirty-six thousand, six hundred twenty".