561620428706635 has 16 divisors (see below), whose sum is σ = 674820731966976. Its totient is φ = 448712511948288.

The previous prime is 561620428706567. The next prime is 561620428706639. The reversal of 561620428706635 is 536607824026165.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561620428706635 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561620428706639) 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, 5312514 + ... + 33933223.

It is an arithmetic number, because the mean of its divisors is an integer number (42176295747936).

Almost surely, 2^{561620428706635} is an apocalyptic number.

561620428706635 is a deficient number, since it is larger than the sum of its proper divisors (113200303260341).

561620428706635 is a wasteful number, since it uses less digits than its factorization.

561620428706635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39249462.

The product of its (nonzero) digits is 87091200, while the sum is 61.

The spelling of 561620428706635 in words is "five hundred sixty-one trillion, six hundred twenty billion, four hundred twenty-eight million, seven hundred six thousand, six hundred thirty-five".