189878677631 has 4 divisors (see below), whose sum is σ = 190396058592. Its totient is φ = 189361296672.

The previous prime is 189878677601. The next prime is 189878677633. The reversal of 189878677631 is 136776878981.

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 189878677631 - 2⁶ = 189878677567 is a prime.

It is a super-2 number, since 2×189878677631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189878677633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258689930 + ... + 258690663.

It is an arithmetic number, because the mean of its divisors is an integer number (47599014648).

Almost surely, 2^189878677631 is an apocalyptic number.

189878677631 is a deficient number, since it is larger than the sum of its proper divisors (517380961).

189878677631 is an equidigital number, since it uses as much as digits as its factorization.

189878677631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517380960.

The product of its digits is 170698752, while the sum is 71.

The spelling of 189878677631 in words is "one hundred eighty-nine billion, eight hundred seventy-eight million, six hundred seventy-seven thousand, six hundred thirty-one".