561272197920 has 768 divisors, whose sum is σ = 2152058388480. Its totient is φ = 120203145216.

The previous prime is 561272197919. The next prime is 561272197921. The reversal of 561272197920 is 29791272165.

It is an interprime number because it is at equal distance from previous prime (561272197919) and next prime (561272197921).

It is not an unprimeable number, because it can be changed into a prime (561272197921) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 851702551 + ... + 851703209.

It is an arithmetic number, because the mean of its divisors is an integer number (2802159360).

Almost surely, 2^561272197920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561272197920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076029194240).

561272197920 is an abundant number, since it is smaller than the sum of its proper divisors (1590786190560).

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

561272197920 is a wasteful number, since it uses less digits than its factorization.

561272197920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 561272197920 in words is "five hundred sixty-one billion, two hundred seventy-two million, one hundred ninety-seven thousand, nine hundred twenty".