56445551261 has 4 divisors (see below), whose sum is σ = 61576965024. Its totient is φ = 51314137500.

The previous prime is 56445551233. The next prime is 56445551263. The reversal of 56445551261 is 16215554465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56445551261 - 2³⁴ = 39265682077 is a prime.

It is a super-2 number, since 2×56445551261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56445551263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565706865 + ... + 2565706886.

It is an arithmetic number, because the mean of its divisors is an integer number (15394241256).

Almost surely, 2^56445551261 is an apocalyptic number.

It is an amenable number.

56445551261 is a deficient number, since it is larger than the sum of its proper divisors (5131413763).

56445551261 is a wasteful number, since it uses less digits than its factorization.

56445551261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131413762.

The product of its digits is 720000, while the sum is 44.

It can be divided in two parts, 56445 and 551261, that added together give a palindrome (607706).

The spelling of 56445551261 in words is "fifty-six billion, four hundred forty-five million, five hundred fifty-one thousand, two hundred sixty-one".