61616757640 has 32 divisors (see below), whose sum is σ = 139729351680. Its totient is φ = 24452632512.

The previous prime is 61616757623. The next prime is 61616757659. The reversal of 61616757640 is 4675761616.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

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, 6059562 + ... + 6069721.

It is an arithmetic number, because the mean of its divisors is an integer number (4366542240).

Almost surely, 2^61616757640 is an apocalyptic number.

It is an amenable number.

61616757640 is an abundant number, since it is smaller than the sum of its proper divisors (78112594040).

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

61616757640 is a wasteful number, since it uses less digits than its factorization.

61616757640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12129421 (or 12129417 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 61616757640 in words is "sixty-one billion, six hundred sixteen million, seven hundred fifty-seven thousand, six hundred forty".