1978199225898 has 32 divisors (see below), whose sum is σ = 4531492362624. Its totient is φ = 563963012352.

The previous prime is 1978199225789. The next prime is 1978199225911. The reversal of 1978199225898 is 8985229918791.

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, 51512515 + ... + 51550902.

It is an arithmetic number, because the mean of its divisors is an integer number (141609136332).

Almost surely, 2^{1978199225898} is an apocalyptic number.

1978199225898 is an abundant number, since it is smaller than the sum of its proper divisors (2553293136726).

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

1978199225898 is a wasteful number, since it uses less digits than its factorization.

1978199225898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103063886.

The product of its digits is 470292480, while the sum is 78.

The spelling of 1978199225898 in words is "one trillion, nine hundred seventy-eight billion, one hundred ninety-nine million, two hundred twenty-five thousand, eight hundred ninety-eight".