1561957688426 has 16 divisors (see below), whose sum is σ = 2400195672000. Its totient is φ = 761894279520.

The previous prime is 1561957688413. The next prime is 1561957688437. The reversal of 1561957688426 is 6248867591651.

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, 1319915 + ... + 2205921.

It is an arithmetic number, because the mean of its divisors is an integer number (150012229500).

Almost surely, 2^{1561957688426} is an apocalyptic number.

1561957688426 is a deficient number, since it is larger than the sum of its proper divisors (838237983574).

1561957688426 is a wasteful number, since it uses less digits than its factorization.

1561957688426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907549.

The product of its digits is 174182400, while the sum is 68.

The spelling of 1561957688426 in words is "one trillion, five hundred sixty-one billion, nine hundred fifty-seven million, six hundred eighty-eight thousand, four hundred twenty-six".