1561148656 has 10 divisors (see below), whose sum is σ = 3024725552. Its totient is φ = 780574320.

The previous prime is 1561148653. The next prime is 1561148671. The reversal of 1561148656 is 6568411651.

It is a super-2 number, since 2×1561148656² = 4874370252261212672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561148651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48785880 + ... + 48785911.

Almost surely, 2^1561148656 is an apocalyptic number.

1561148656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561148656 is a deficient number, since it is larger than the sum of its proper divisors (1463576896).

1561148656 is an equidigital number, since it uses as much as digits as its factorization.

1561148656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97571799 (or 97571793 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 1561148656 is about 39511.3737549076. The cubic root of 1561148656 is about 1160.0625848120.

The spelling of 1561148656 in words is "one billion, five hundred sixty-one million, one hundred forty-eight thousand, six hundred fifty-six".