61615650625 has 15 divisors (see below), whose sum is σ = 77002672351. Its totient is φ = 49287556000.

The previous prime is 61615650619. The next prime is 61615650643. The reversal of 61615650625 is 52605651616.

The square root of 61615650625 is 248225.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 59441853249 + 2173797376 = 243807^2 + 46624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61615650625 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6200661 + ... + 6210589.

Almost surely, 2^61615650625 is an apocalyptic number.

61615650625 is the 248225-th square number.

61615650625 is the 124113-rd centered octagonal number.

It is an amenable number.

61615650625 is a deficient number, since it is larger than the sum of its proper divisors (15387021726).

61615650625 is an frugal number, since it uses more digits than its factorization.

61615650625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19878 (or 9934 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 43.

Subtracting from 61615650625 its reverse (52605651616), we obtain a palindrome (9009999009).

The spelling of 61615650625 in words is "sixty-one billion, six hundred fifteen million, six hundred fifty thousand, six hundred twenty-five".