187199805681604 has 81 divisors (see below), whose sum is σ = 343322477280909. Its totient is φ = 89310168336960.

The previous prime is 187199805681503. The next prime is 187199805681683. The reversal of 187199805681604 is 406186508991781.

The square root of 187199805681604 is 13682098.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 106263729064900 + 80936076616704 = 10308430^2 + 8996448^2 .

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 61925174037 + ... + 61925177059.

Almost surely, 2^{187199805681604} is an apocalyptic number.

187199805681604 is the 13682098-th square number.

It is an amenable number.

187199805681604 is a deficient number, since it is larger than the sum of its proper divisors (156122671599305).

187199805681604 is an frugal number, since it uses more digits than its factorization.

187199805681604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6258 (or 3129 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 73.

The spelling of 187199805681604 in words is "one hundred eighty-seven trillion, one hundred ninety-nine billion, eight hundred five million, six hundred eighty-one thousand, six hundred four".