661463579924 has 48 divisors (see below), whose sum is σ = 1360133978112. Its totient is φ = 275527878912.

The previous prime is 661463579921. The next prime is 661463579929. The reversal of 661463579924 is 429975364166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661463579921) 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, 630029 + ... + 1311435.

It is an arithmetic number, because the mean of its divisors is an integer number (28336124544).

Almost surely, 2^661463579924 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 661463579924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680066989056).

661463579924 is an abundant number, since it is smaller than the sum of its proper divisors (698670398188).

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

661463579924 is a wasteful number, since it uses less digits than its factorization.

661463579924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682392 (or 682390 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 62.

The spelling of 661463579924 in words is "six hundred sixty-one billion, four hundred sixty-three million, five hundred seventy-nine thousand, nine hundred twenty-four".