61256436731 has 4 divisors (see below), whose sum is σ = 70007356272. Its totient is φ = 52505517192.

The previous prime is 61256436721. The next prime is 61256436733. The reversal of 61256436731 is 13763465216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61256436731 - 2⁶ = 61256436667 is a prime.

It is a super-2 number, since 2×61256436731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61256436733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4375459760 + ... + 4375459773.

It is an arithmetic number, because the mean of its divisors is an integer number (17501839068).

Almost surely, 2^61256436731 is an apocalyptic number.

61256436731 is a deficient number, since it is larger than the sum of its proper divisors (8750919541).

61256436731 is an equidigital number, since it uses as much as digits as its factorization.

61256436731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750919540.

The product of its digits is 544320, while the sum is 44.

The spelling of 61256436731 in words is "sixty-one billion, two hundred fifty-six million, four hundred thirty-six thousand, seven hundred thirty-one".