561323612487838 has 64 divisors (see below), whose sum is σ = 860319695394432. Its totient is φ = 274634285875200.

The previous prime is 561323612487791. The next prime is 561323612487929. The reversal of 561323612487838 is 838784216323165.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18517571770 + ... + 18517602082.

It is an arithmetic number, because the mean of its divisors is an integer number (13442495240538).

Almost surely, 2^{561323612487838} is an apocalyptic number.

561323612487838 is a deficient number, since it is larger than the sum of its proper divisors (298996082906594).

561323612487838 is a wasteful number, since it uses less digits than its factorization.

561323612487838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33509.

The product of its digits is 278691840, while the sum is 67.

The spelling of 561323612487838 in words is "five hundred sixty-one trillion, three hundred twenty-three billion, six hundred twelve million, four hundred eighty-seven thousand, eight hundred thirty-eight".