561912153664 has 21 divisors (see below), whose sum is σ = 1115056330081. Its totient is φ = 280953078400.

The previous prime is 561912153661. The next prime is 561912153667. The reversal of 561912153664 is 466351219165.

The square root of 561912153664 is 749608.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (561912153661) and next prime (561912153667).

It can be written as a sum of positive squares in only one way, i.e., 545813619264 + 16098534400 = 738792^2 + 126880^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561912153661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5950014 + ... + 6043714.

Almost surely, 2^561912153664 is an apocalyptic number.

561912153664 is the 749608-th square number.

It is an amenable number.

561912153664 is a deficient number, since it is larger than the sum of its proper divisors (553144176417).

561912153664 is an frugal number, since it uses more digits than its factorization.

561912153664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187414 (or 93703 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 49.

Multiplying 561912153664 by its sum of digits (49), we get a square (27533695529536 = 5247256²).

The spelling of 561912153664 in words is "five hundred sixty-one billion, nine hundred twelve million, one hundred fifty-three thousand, six hundred sixty-four".