61218818105625 has 30 divisors (see below), whose sum is σ = 110498606272626. Its totient is φ = 32650036320000.

The previous prime is 61218818105609. The next prime is 61218818105663. The reversal of 61218818105625 is 52650181881216.

It is a happy number.

61218818105625 is a `hidden beast` number, since 6 + 1 + 2 + 1 + 8 + 8 + 1 + 8 + 1 + 0 + 5 + 625 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 40612783769856 + 20606034335769 = 6372816^2 + 4539387^2 .

It is not a de Polignac number, because 61218818105625 - 2⁴ = 61218818105609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5441667096 + ... + 5441678345.

Almost surely, 2^{61218818105625} is an apocalyptic number.

It is an amenable number.

61218818105625 is a deficient number, since it is larger than the sum of its proper divisors (49279788167001).

61218818105625 is a wasteful number, since it uses less digits than its factorization.

61218818105625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10883345467 (or 10883345449 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 54.

The spelling of 61218818105625 in words is "sixty-one trillion, two hundred eighteen billion, eight hundred eighteen million, one hundred five thousand, six hundred twenty-five".