561265256375155 has 16 divisors (see below), whose sum is σ = 689972565127104. Its totient is φ = 438043556677120.

The previous prime is 561265256375149. The next prime is 561265256375233. The reversal of 561265256375155 is 551573652562165.

It is a happy number.

It is not a de Polignac number, because 561265256375155 - 2³ = 561265256375147 is a prime.

It is a super-3 number, since 3×561265256375155³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48279007 + ... + 58765576.

It is an arithmetic number, because the mean of its divisors is an integer number (43123285320444).

Almost surely, 2^{561265256375155} is an apocalyptic number.

561265256375155 is a deficient number, since it is larger than the sum of its proper divisors (128707308751949).

561265256375155 is a wasteful number, since it uses less digits than its factorization.

561265256375155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107070206.

The product of its digits is 283500000, while the sum is 64.

The spelling of 561265256375155 in words is "five hundred sixty-one trillion, two hundred sixty-five billion, two hundred fifty-six million, three hundred seventy-five thousand, one hundred fifty-five".