61652991640 has 64 divisors (see below), whose sum is σ = 141144314400. Its totient is φ = 24230510592.

The previous prime is 61652991599. The next prime is 61652991683. The reversal of 61652991640 is 4619925616.

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, 5405784 + ... + 5417176.

Almost surely, 2^61652991640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61652991640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70572157200).

61652991640 is an abundant number, since it is smaller than the sum of its proper divisors (79491322760).

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

61652991640 is a wasteful number, since it uses less digits than its factorization.

61652991640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13756 (or 13752 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 61652991640 in words is "sixty-one billion, six hundred fifty-two million, nine hundred ninety-one thousand, six hundred forty".