61646312125 has 8 divisors (see below), whose sum is σ = 76934597688. Its totient is φ = 49317049600.

The previous prime is 61646312111. The next prime is 61646312153. The reversal of 61646312125 is 52121364616.

61646312125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1608571449 + 60037740676 = 40107^2 + 245026^2 .

It is not a de Polignac number, because 61646312125 - 2⁵ = 61646312093 is a prime.

It is a super-2 number, since 2×61646312125² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246585124 + ... + 246585373.

It is an arithmetic number, because the mean of its divisors is an integer number (9616824711).

Almost surely, 2^61646312125 is an apocalyptic number.

It is an amenable number.

61646312125 is a deficient number, since it is larger than the sum of its proper divisors (15288285563).

61646312125 is an equidigital number, since it uses as much as digits as its factorization.

61646312125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493170512 (or 493170502 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The spelling of 61646312125 in words is "sixty-one billion, six hundred forty-six million, three hundred twelve thousand, one hundred twenty-five".