1866979055898 has 24 divisors (see below), whose sum is σ = 4412859587136. Its totient is φ = 565751229000.

The previous prime is 1866979055869. The next prime is 1866979055933. The reversal of 1866979055898 is 8985509796681.

It is a super-2 number, since 2×1866979055898² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4714593378 + ... + 4714593773.

It is an arithmetic number, because the mean of its divisors is an integer number (183869149464).

Almost surely, 2^{1866979055898} is an apocalyptic number.

1866979055898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1866979055898 is an abundant number, since it is smaller than the sum of its proper divisors (2545880531238).

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

1866979055898 is a wasteful number, since it uses less digits than its factorization.

1866979055898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9429187170 (or 9429187167 counting only the distinct ones).

The product of its (nonzero) digits is 2351462400, while the sum is 81.

The spelling of 1866979055898 in words is "one trillion, eight hundred sixty-six billion, nine hundred seventy-nine million, fifty-five thousand, eight hundred ninety-eight".