1561164156 has 36 divisors (see below), whose sum is σ = 3981209232. Its totient is φ = 515781504.

The previous prime is 1561164113. The next prime is 1561164217. The reversal of 1561164156 is 6514611651.

1561164156 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 1 + 641 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1561164156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187816 + ... + 195951.

Almost surely, 2^1561164156 is an apocalyptic number.

It is an amenable number.

1561164156 is an abundant number, since it is smaller than the sum of its proper divisors (2420045076).

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

1561164156 is a wasteful number, since it uses less digits than its factorization.

1561164156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383890 (or 383885 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1561164156 is about 39511.5699004735. The cubic root of 1561164156 is about 1160.0664240600.

The spelling of 1561164156 in words is "one billion, five hundred sixty-one million, one hundred sixty-four thousand, one hundred fifty-six".