188451680989 has 12 divisors (see below), whose sum is σ = 223075036828. Its totient is φ = 158141269440.

The previous prime is 188451680969. The next prime is 188451681007. The reversal of 188451680989 is 989086154881.

It can be written as a sum of positive squares in 2 ways, for example, as 68366560900 + 120085120089 = 261470^2 + 346533^2 .

It is not a de Polignac number, because 188451680989 - 2⁵ = 188451680957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188451680969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59900424 + ... + 59903569.

Almost surely, 2^188451680989 is an apocalyptic number.

It is an amenable number.

188451680989 is a deficient number, since it is larger than the sum of its proper divisors (34623355839).

188451680989 is a wasteful number, since it uses less digits than its factorization.

188451680989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119804028 (or 119804017 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 67.

The spelling of 188451680989 in words is "one hundred eighty-eight billion, four hundred fifty-one million, six hundred eighty thousand, nine hundred eighty-nine".