189878677633 has 2 divisors, whose sum is σ = 189878677634. Its totient is φ = 189878677632.

The previous prime is 189878677601. The next prime is 189878677649. The reversal of 189878677633 is 336776878981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181081738369 + 8796939264 = 425537^2 + 93792^2 .

It is a cyclic number.

It is not a de Polignac number, because 189878677633 - 2⁵ = 189878677601 is a prime.

It is not a weakly prime, because it can be changed into another prime (189878677333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94939338816 + 94939338817.

It is an arithmetic number, because the mean of its divisors is an integer number (94939338817).

Almost surely, 2^189878677633 is an apocalyptic number.

It is an amenable number.

189878677633 is a deficient number, since it is larger than the sum of its proper divisors (1).

189878677633 is an equidigital number, since it uses as much as digits as its factorization.

189878677633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512096256, while the sum is 73.

The spelling of 189878677633 in words is "one hundred eighty-nine billion, eight hundred seventy-eight million, six hundred seventy-seven thousand, six hundred thirty-three".