61929721492 has 48 divisors (see below), whose sum is σ = 111552819840. Its totient is φ = 30065126400.

The previous prime is 61929721487. The next prime is 61929721493. The reversal of 61929721492 is 29412792916.

61929721492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61929721493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47747788 + ... + 47749084.

It is an arithmetic number, because the mean of its divisors is an integer number (2324017080).

Almost surely, 2^61929721492 is an apocalyptic number.

It is an amenable number.

61929721492 is a deficient number, since it is larger than the sum of its proper divisors (49623098348).

61929721492 is a wasteful number, since it uses less digits than its factorization.

61929721492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512 (or 2510 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The spelling of 61929721492 in words is "sixty-one billion, nine hundred twenty-nine million, seven hundred twenty-one thousand, four hundred ninety-two".