956561638 has 16 divisors (see below), whose sum is σ = 1445220000. Its totient is φ = 474829056.

The previous prime is 956561623. The next prime is 956561647. The reversal of 956561638 is 836165659.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 956561591 and 956561600.

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, 416020 + ... + 418312.

It is an arithmetic number, because the mean of its divisors is an integer number (90326250).

Almost surely, 2^956561638 is an apocalyptic number.

956561638 is a deficient number, since it is larger than the sum of its proper divisors (488658362).

956561638 is a wasteful number, since it uses less digits than its factorization.

956561638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711.

The product of its digits is 1166400, while the sum is 49.

The square root of 956561638 is about 30928.3306694687. The cubic root of 956561638 is about 985.3056805911.

The spelling of 956561638 in words is "nine hundred fifty-six million, five hundred sixty-one thousand, six hundred thirty-eight".