15640140402 has 24 divisors (see below), whose sum is σ = 34028766720. Its totient is φ = 5191565400.

The previous prime is 15640140401. The next prime is 15640140407. The reversal of 15640140402 is 20404104651.

15640140402 is a `hidden beast` number, since 1 + 5 + 640 + 14 + 0 + 4 + 0 + 2 = 666.

15640140402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15640140402² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15640140401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1813474 + ... + 1822077.

It is an arithmetic number, because the mean of its divisors is an integer number (1417865280).

Almost surely, 2^15640140402 is an apocalyptic number.

15640140402 is an abundant number, since it is smaller than the sum of its proper divisors (18388626318).

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

15640140402 is a wasteful number, since it uses less digits than its factorization.

15640140402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635798 (or 3635795 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 15640140402 in words is "fifteen billion, six hundred forty million, one hundred forty thousand, four hundred two".