561942891801 has 6 divisors (see below), whose sum is σ = 811695288170. Its totient is φ = 374628594528.

The previous prime is 561942891781. The next prime is 561942891803. The reversal of 561942891801 is 108198249165.

561942891801 is a `hidden beast` number, since 5 + 619 + 4 + 2 + 8 + 9 + 18 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 368571624201 + 193371267600 = 607101^2 + 439740^2 .

It is not a de Polignac number, because 561942891801 - 2⁶ = 561942891737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561942891803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31219049536 + ... + 31219049553.

Almost surely, 2^561942891801 is an apocalyptic number.

It is an amenable number.

561942891801 is a deficient number, since it is larger than the sum of its proper divisors (249752396369).

561942891801 is a wasteful number, since it uses less digits than its factorization.

561942891801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62438099095 (or 62438099092 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 561942891801 in words is "five hundred sixty-one billion, nine hundred forty-two million, eight hundred ninety-one thousand, eight hundred one".