1561351464 has 40 divisors (see below), whose sum is σ = 4373231610. Its totient is φ = 520450272.

The previous prime is 1561351459. The next prime is 1561351471. The reversal of 1561351464 is 4641531651.

1561351464 is a `hidden beast` number, since 1 + 561 + 3 + 51 + 46 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1561040100 + 311364 = 39510^2 + 558^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1204099 + ... + 1205394.

Almost surely, 2^1561351464 is an apocalyptic number.

It is an amenable number.

1561351464 is an abundant number, since it is smaller than the sum of its proper divisors (2811880146).

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

1561351464 is a wasteful number, since it uses less digits than its factorization.

1561351464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409511 (or 2409498 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1561351464 is about 39513.9401224429. The cubic root of 1561351464 is about 1160.1128170101.

The spelling of 1561351464 in words is "one billion, five hundred sixty-one million, three hundred fifty-one thousand, four hundred sixty-four".