1561632968 has 16 divisors (see below), whose sum is σ = 3346356480. Its totient is φ = 669271248.

The previous prime is 1561632953. The next prime is 1561632983. The reversal of 1561632968 is 8692361651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1561632953) and next prime (1561632983).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13943096 + ... + 13943207.

It is an arithmetic number, because the mean of its divisors is an integer number (209147280).

Almost surely, 2^1561632968 is an apocalyptic number.

It is an amenable number.

1561632968 is an abundant number, since it is smaller than the sum of its proper divisors (1784723512).

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

1561632968 is a wasteful number, since it uses less digits than its factorization.

1561632968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27886316 (or 27886312 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The square root of 1561632968 is about 39517.5020465616. The cubic root of 1561632968 is about 1160.1825337013.

It can be divided in two parts, 15616 and 32968, that added together give a palindrome (48584).

The spelling of 1561632968 in words is "one billion, five hundred sixty-one million, six hundred thirty-two thousand, nine hundred sixty-eight".