61980932640 has 96 divisors (see below), whose sum is σ = 212989041216. Its totient is φ = 15025679360.

The previous prime is 61980932623. The next prime is 61980932687. The reversal of 61980932640 is 4623908916.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 61980932640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5864127 + ... + 5874686.

It is an arithmetic number, because the mean of its divisors is an integer number (2218635846).

Almost surely, 2^61980932640 is an apocalyptic number.

61980932640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61980932640 is an abundant number, since it is smaller than the sum of its proper divisors (151008108576).

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

61980932640 is a wasteful number, since it uses less digits than its factorization.

61980932640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11738842 (or 11738834 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 61980932640 in words is "sixty-one billion, nine hundred eighty million, nine hundred thirty-two thousand, six hundred forty".