61921710624 has 48 divisors (see below), whose sum is σ = 169611648192. Its totient is φ = 19743153408.

The previous prime is 61921710623. The next prime is 61921710649. The reversal of 61921710624 is 42601712916.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (61921710623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14019919 + ... + 14024334.

It is an arithmetic number, because the mean of its divisors is an integer number (3533576004).

Almost surely, 2^61921710624 is an apocalyptic number.

It is an amenable number.

61921710624 is an abundant number, since it is smaller than the sum of its proper divisors (107689937568).

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

61921710624 is a wasteful number, since it uses less digits than its factorization.

61921710624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28044289 (or 28044281 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 61921710624 in words is "sixty-one billion, nine hundred twenty-one million, seven hundred ten thousand, six hundred twenty-four".