15640291950478 has 16 divisors (see below), whose sum is σ = 25265157704640. Its totient is φ = 7218576082656.

The previous prime is 15640291950463. The next prime is 15640291950499. The reversal of 15640291950478 is 87405919204651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12796176 + ... + 13965052.

It is an arithmetic number, because the mean of its divisors is an integer number (1579072356540).

Almost surely, 2^{15640291950478} is an apocalyptic number.

15640291950478 is a deficient number, since it is larger than the sum of its proper divisors (9624865754162).

15640291950478 is a wasteful number, since it uses less digits than its factorization.

15640291950478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683531.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 15640291950478 in words is "fifteen trillion, six hundred forty billion, two hundred ninety-one million, nine hundred fifty thousand, four hundred seventy-eight".