188199979973 has 2 divisors, whose sum is σ = 188199979974. Its totient is φ = 188199979972.

The previous prime is 188199979939. The next prime is 188199979991. The reversal of 188199979973 is 379979991881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102478094884 + 85721885089 = 320122^2 + 292783^2 .

It is a cyclic number.

It is not a de Polignac number, because 188199979973 - 2¹⁶ = 188199914437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188199979673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94099989986 + 94099989987.

It is an arithmetic number, because the mean of its divisors is an integer number (94099989987).

Almost surely, 2^188199979973 is an apocalyptic number.

It is an amenable number.

188199979973 is a deficient number, since it is larger than the sum of its proper divisors (1).

188199979973 is an equidigital number, since it uses as much as digits as its factorization.

188199979973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555532992, while the sum is 80.

The spelling of 188199979973 in words is "one hundred eighty-eight billion, one hundred ninety-nine million, nine hundred seventy-nine thousand, nine hundred seventy-three".