899806751978 has 16 divisors (see below), whose sum is σ = 1358528547456. Its totient is φ = 446973310080.

The previous prime is 899806751953. The next prime is 899806751981. The reversal of 899806751978 is 879157608998.

It is a junction number, because it is equal to n+sod(n) for n = 899806751899 and 899806751908.

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, 2160176 + ... + 2542827.

It is an arithmetic number, because the mean of its divisors is an integer number (84908034216).

Almost surely, 2^899806751978 is an apocalyptic number.

899806751978 is a deficient number, since it is larger than the sum of its proper divisors (458721795478).

899806751978 is a wasteful number, since it uses less digits than its factorization.

899806751978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4703629.

The product of its (nonzero) digits is 548674560, while the sum is 77.

The spelling of 899806751978 in words is "eight hundred ninety-nine billion, eight hundred six million, seven hundred fifty-one thousand, nine hundred seventy-eight".