1561677426 has 48 divisors (see below), whose sum is σ = 3679527384. Its totient is φ = 476692992.

The previous prime is 1561677407. The next prime is 1561677427. The reversal of 1561677426 is 6247761651.

1561677426 is a `hidden beast` number, since 1 + 5 + 616 + 7 + 7 + 4 + 26 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1526855625 + 34821801 = 39075^2 + 5901^2 .

It is not an unprimeable number, because it can be changed into a prime (1561677427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57645 + ... + 80288.

Almost surely, 2^1561677426 is an apocalyptic number.

1561677426 is an abundant number, since it is smaller than the sum of its proper divisors (2117849958).

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

1561677426 is a wasteful number, since it uses less digits than its factorization.

1561677426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137995 (or 137992 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 1561677426 is about 39518.0645528093. The cubic root of 1561677426 is about 1160.1935433104.

The spelling of 1561677426 in words is "one billion, five hundred sixty-one million, six hundred seventy-seven thousand, four hundred twenty-six".