561257752165 has 16 divisors (see below), whose sum is σ = 736626234240. Its totient is φ = 407138115520.

The previous prime is 561257752157. The next prime is 561257752189.

It is a happy number.

561257752165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 561257752165 - 2³ = 561257752157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13095169 + ... + 13137958.

It is an arithmetic number, because the mean of its divisors is an integer number (46039139640).

Almost surely, 2^561257752165 is an apocalyptic number.

561257752165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561257752165 is a deficient number, since it is larger than the sum of its proper divisors (175368482075).

561257752165 is a wasteful number, since it uses less digits than its factorization.

561257752165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26233532.

The product of its digits is 4410000, while the sum is 52.

The spelling of 561257752165 in words is "five hundred sixty-one billion, two hundred fifty-seven million, seven hundred fifty-two thousand, one hundred sixty-five".