198151400164 has 27 divisors (see below), whose sum is σ = 362534661097. Its totient is φ = 94758267824.

The previous prime is 198151400131. The next prime is 198151400179. The reversal of 198151400164 is 461004151891.

The square root of 198151400164 is 445142.

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., 135254772900 + 62896627264 = 367770^2 + 250792^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20471694 + ... + 20481370.

Almost surely, 2^198151400164 is an apocalyptic number.

198151400164 is the 445142-nd square number.

It is an amenable number.

198151400164 is a deficient number, since it is larger than the sum of its proper divisors (164383260933).

198151400164 is an frugal number, since it uses more digits than its factorization.

198151400164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19404 (or 9702 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 198151400164 in words is "one hundred ninety-eight billion, one hundred fifty-one million, four hundred thousand, one hundred sixty-four".