61231916394 has 48 divisors (see below), whose sum is σ = 145596709440. Its totient is φ = 18444007680.

The previous prime is 61231916387. The next prime is 61231916419. The reversal of 61231916394 is 49361913216.

61231916394 is a `hidden beast` number, since 6 + 1 + 2 + 3 + 1 + 9 + 1 + 639 + 4 = 666.

61231916394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 892839 + ... + 958970.

It is an arithmetic number, because the mean of its divisors is an integer number (3033264780).

Almost surely, 2^61231916394 is an apocalyptic number.

61231916394 is an abundant number, since it is smaller than the sum of its proper divisors (84364793046).

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

61231916394 is a wasteful number, since it uses less digits than its factorization.

61231916394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851995 (or 1851992 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The spelling of 61231916394 in words is "sixty-one billion, two hundred thirty-one million, nine hundred sixteen thousand, three hundred ninety-four".