198810815604 has 12 divisors (see below), whose sum is σ = 463891903104. Its totient is φ = 66270271864.

The previous prime is 198810815597. The next prime is 198810815653. The reversal of 198810815604 is 406518018891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×198810815604² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8283783972 + ... + 8283783995.

It is an arithmetic number, because the mean of its divisors is an integer number (38657658592).

Almost surely, 2^198810815604 is an apocalyptic number.

It is an amenable number.

198810815604 is an abundant number, since it is smaller than the sum of its proper divisors (265081087500).

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

198810815604 is a wasteful number, since it uses less digits than its factorization.

198810815604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16567567974 (or 16567567972 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 51.

The spelling of 198810815604 in words is "one hundred ninety-eight billion, eight hundred ten million, eight hundred fifteen thousand, six hundred four".