61251578586731 has 16 divisors (see below), whose sum is σ = 66148258202880. Its totient is φ = 56381469824160.

The previous prime is 61251578586719. The next prime is 61251578586733. The reversal of 61251578586731 is 13768587515216.

It is a de Polignac number, because none of the positive numbers 2^k-61251578586731 is a prime.

It is a super-2 number, since 2×61251578586731² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61251578586733) 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, 7640360 + ... + 13449098.

It is an arithmetic number, because the mean of its divisors is an integer number (4134266137680).

Almost surely, 2^{61251578586731} is an apocalyptic number.

61251578586731 is a deficient number, since it is larger than the sum of its proper divisors (4896679616149).

61251578586731 is a wasteful number, since it uses less digits than its factorization.

61251578586731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811026.

The product of its digits is 84672000, while the sum is 65.

The spelling of 61251578586731 in words is "sixty-one trillion, two hundred fifty-one billion, five hundred seventy-eight million, five hundred eighty-six thousand, seven hundred thirty-one".