251555080198 has 4 divisors (see below), whose sum is σ = 377332620300. Its totient is φ = 125777540098.

The previous prime is 251555080181. The next prime is 251555080247. The reversal of 251555080198 is 891080555152.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62888770048 + ... + 62888770051.

It is an arithmetic number, because the mean of its divisors is an integer number (94333155075).

Almost surely, 2^251555080198 is an apocalyptic number.

251555080198 is a deficient number, since it is larger than the sum of its proper divisors (125777540102).

251555080198 is a wasteful number, since it uses less digits than its factorization.

251555080198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125777540101.

The product of its (nonzero) digits is 720000, while the sum is 49.

The spelling of 251555080198 in words is "two hundred fifty-one billion, five hundred fifty-five million, eighty thousand, one hundred ninety-eight".