190861897122 has 90 divisors (see below), whose sum is σ = 452879912277. Its totient is φ = 58066886592.

The previous prime is 190861897117. The next prime is 190861897139. The reversal of 190861897122 is 221798168091.

It is a happy number.

190861897122 is a `hidden beast` number, since 1 + 9 + 0 + 8 + 618 + 9 + 7 + 12 + 2 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 144300457161 + 46561439961 = 379869^2 + 215781^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=308919.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2144515654 + ... + 2144515742.

Almost surely, 2^190861897122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 190861897122

190861897122 is an abundant number, since it is smaller than the sum of its proper divisors (262018015155).

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

190861897122 is an frugal number, since it uses more digits than its factorization.

190861897122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 190861897122 in words is "one hundred ninety billion, eight hundred sixty-one million, eight hundred ninety-seven thousand, one hundred twenty-two".