1156661560 has 16 divisors (see below), whose sum is σ = 2602488600. Its totient is φ = 462664608.

The previous prime is 1156661557. The next prime is 1156661563. The reversal of 1156661560 is 651666511.

It is an interprime number because it is at equal distance from previous prime (1156661557) and next prime (1156661563).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156661563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14458230 + ... + 14458309.

Almost surely, 2^1156661560 is an apocalyptic number.

1156661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156661560 is an abundant number, since it is smaller than the sum of its proper divisors (1445827040).

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

1156661560 is a wasteful number, since it uses less digits than its factorization.

1156661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28916550 (or 28916546 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1156661560 is about 34009.7274320157. The cubic root of 1156661560 is about 1049.7086296599.

The spelling of 1156661560 in words is "one billion, one hundred fifty-six million, six hundred sixty-one thousand, five hundred sixty".