61639252825 has 12 divisors (see below), whose sum is σ = 76435992828. Its totient is φ = 49309260800.

The previous prime is 61639252789. The next prime is 61639252849. The reversal of 61639252825 is 52825293616.

It can be written as a sum of positive squares in 6 ways, for example, as 5034753936 + 56604498889 = 70956^2 + 237917^2 .

It is not a de Polignac number, because 61639252825 - 2⁹ = 61639252313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801249 + ... + 874801.

It is an arithmetic number, because the mean of its divisors is an integer number (6369666069).

Almost surely, 2^61639252825 is an apocalyptic number.

It is an amenable number.

61639252825 is a deficient number, since it is larger than the sum of its proper divisors (14796740003).

61639252825 is a wasteful number, since it uses less digits than its factorization.

61639252825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107084 (or 107079 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The spelling of 61639252825 in words is "sixty-one billion, six hundred thirty-nine million, two hundred fifty-two thousand, eight hundred twenty-five".