189918911015 has 4 divisors (see below), whose sum is σ = 227902693224. Its totient is φ = 151935128808.

The previous prime is 189918910997. The next prime is 189918911029. The reversal of 189918911015 is 510119819981.

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

It is a cyclic number.

It is not a de Polignac number, because 189918911015 - 2¹⁴ = 189918894631 is a prime.

It is a super-2 number, since 2×189918911015² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

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, 18991891097 + ... + 18991891106.

It is an arithmetic number, because the mean of its divisors is an integer number (56975673306).

Almost surely, 2^189918911015 is an apocalyptic number.

189918911015 is a deficient number, since it is larger than the sum of its proper divisors (37983782209).

189918911015 is an equidigital number, since it uses as much as digits as its factorization.

189918911015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37983782208.

The product of its (nonzero) digits is 233280, while the sum is 53.

The spelling of 189918911015 in words is "one hundred eighty-nine billion, nine hundred eighteen million, nine hundred eleven thousand, fifteen".