61645431546 has 48 divisors (see below), whose sum is σ = 134034825600. Its totient is φ = 20476299744.

The previous prime is 61645431527. The next prime is 61645431563. The reversal of 61645431546 is 64513454616.

61645431546 is a `hidden beast` number, since 6 + 1 + 64 + 5 + 43 + 1 + 546 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12139560 + ... + 12144636.

It is an arithmetic number, because the mean of its divisors is an integer number (2792392200).

Almost surely, 2^61645431546 is an apocalyptic number.

61645431546 is an abundant number, since it is smaller than the sum of its proper divisors (72389394054).

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

61645431546 is a wasteful number, since it uses less digits than its factorization.

61645431546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7323 (or 7320 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 61645431546 in words is "sixty-one billion, six hundred forty-five million, four hundred thirty-one thousand, five hundred forty-six".