188072424881 has 6 divisors (see below), whose sum is σ = 206724235746. Its totient is φ = 170974931600.

The previous prime is 188072424877. The next prime is 188072424887. The reversal of 188072424881 is 188424270881.

It can be written as a sum of positive squares in only one way, i.e., 167129704225 + 20942720656 = 408815^2 + 144716^2 .

It is not a de Polignac number, because 188072424881 - 2² = 188072424877 is a prime.

It is a super-2 number, since 2×188072424881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (188072424887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777158660 + ... + 777158901.

It is an arithmetic number, because the mean of its divisors is an integer number (34454039291).

Almost surely, 2^188072424881 is an apocalyptic number.

188072424881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

188072424881 is a deficient number, since it is larger than the sum of its proper divisors (18651810865).

188072424881 is a wasteful number, since it uses less digits than its factorization.

188072424881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554317583 (or 1554317572 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 53.

The spelling of 188072424881 in words is "one hundred eighty-eight billion, seventy-two million, four hundred twenty-four thousand, eight hundred eighty-one".