61640525244 has 48 divisors (see below), whose sum is σ = 144536674688. Its totient is φ = 20445784128.

The previous prime is 61640525201. The next prime is 61640525263. The reversal of 61640525244 is 44252504616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2604207 + ... + 2627769.

Almost surely, 2^61640525244 is an apocalyptic number.

It is an amenable number.

61640525244 is an abundant number, since it is smaller than the sum of its proper divisors (82896149444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61640525244 is a wasteful number, since it uses less digits than its factorization.

61640525244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24634 (or 24632 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

The spelling of 61640525244 in words is "sixty-one billion, six hundred forty million, five hundred twenty-five thousand, two hundred forty-four".