198690211561 has 8 divisors (see below), whose sum is σ = 203569075584. Its totient is φ = 193812907680.

The previous prime is 198690211541. The next prime is 198690211567. The reversal of 198690211561 is 165112096891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198690211561 - 2³⁵ = 164330473193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198690211567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130101 + ... + 643666.

It is an arithmetic number, because the mean of its divisors is an integer number (25446134448).

Almost surely, 2^198690211561 is an apocalyptic number.

It is an amenable number.

198690211561 is a deficient number, since it is larger than the sum of its proper divisors (4878864023).

198690211561 is an equidigital number, since it uses as much as digits as its factorization.

198690211561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780071.

The product of its (nonzero) digits is 233280, while the sum is 49.

The spelling of 198690211561 in words is "one hundred ninety-eight billion, six hundred ninety million, two hundred eleven thousand, five hundred sixty-one".