816616401380 has 48 divisors (see below), whose sum is σ = 1847472743424. Its totient is φ = 301411601280.

The previous prime is 816616401373. The next prime is 816616401449. The reversal of 816616401380 is 83104616618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162989 + ... + 1288331.

It is an arithmetic number, because the mean of its divisors is an integer number (38489015488).

Almost surely, 2^816616401380 is an apocalyptic number.

It is an amenable number.

816616401380 is an abundant number, since it is smaller than the sum of its proper divisors (1030856342044).

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

816616401380 is a wasteful number, since it uses less digits than its factorization.

816616401380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128156 (or 1128154 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 816616401380 in words is "eight hundred sixteen billion, six hundred sixteen million, four hundred one thousand, three hundred eighty".