816658477220 has 24 divisors (see below), whose sum is σ = 1715025225984. Its totient is φ = 326655310176.

The previous prime is 816658477213. The next prime is 816658477237. The reversal of 816658477220 is 22774856618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359789 + ... + 1327691.

It is an arithmetic number, because the mean of its divisors is an integer number (71459384416).

Almost surely, 2^816658477220 is an apocalyptic number.

It is an amenable number.

816658477220 is an abundant number, since it is smaller than the sum of its proper divisors (898366748764).

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

816658477220 is a wasteful number, since it uses less digits than its factorization.

816658477220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010099 (or 1010097 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 816658477220 in words is "eight hundred sixteen billion, six hundred fifty-eight million, four hundred seventy-seven thousand, two hundred twenty".