199986542634 has 32 divisors (see below), whose sum is σ = 410110718976. Its totient is φ = 64983878000.

The previous prime is 199986542627. The next prime is 199986542653. The reversal of 199986542634 is 436245689991.

It is a Curzon number.

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, 1341912 + ... + 1483475.

It is an arithmetic number, because the mean of its divisors is an integer number (12815959968).

Almost surely, 2^199986542634 is an apocalyptic number.

199986542634 is an abundant number, since it is smaller than the sum of its proper divisors (210124176342).

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

199986542634 is a wasteful number, since it uses less digits than its factorization.

199986542634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825690.

The product of its digits is 100776960, while the sum is 66.

The spelling of 199986542634 in words is "one hundred ninety-nine billion, nine hundred eighty-six million, five hundred forty-two thousand, six hundred thirty-four".