561040398621 has 16 divisors (see below), whose sum is σ = 834898193920. Its totient is φ = 372349677600.

The previous prime is 561040398617. The next prime is 561040398643. The reversal of 561040398621 is 126893040165.

561040398621 is a `hidden beast` number, since 5 + 6 + 10 + 4 + 0 + 3 + 9 + 8 + 621 = 666.

It is not a de Polignac number, because 561040398621 - 2² = 561040398617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561040398661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46584280 + ... + 46596321.

It is an arithmetic number, because the mean of its divisors is an integer number (52181137120).

Almost surely, 2^561040398621 is an apocalyptic number.

It is an amenable number.

561040398621 is a deficient number, since it is larger than the sum of its proper divisors (273857795299).

561040398621 is a wasteful number, since it uses less digits than its factorization.

561040398621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93180833 (or 93180827 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 561040398621 in words is "five hundred sixty-one billion, forty million, three hundred ninety-eight thousand, six hundred twenty-one".