117772213345981 has 2 divisors, whose sum is σ = 117772213345982. Its totient is φ = 117772213345980.

The previous prime is 117772213345901. The next prime is 117772213345991. The reversal of 117772213345981 is 189543312277711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116178950905956 + 1593262440025 = 10778634^2 + 1262245^2 .

It is a cyclic number.

It is not a de Polignac number, because 117772213345981 - 2¹³ = 117772213337789 is a prime.

It is a super-2 number, since 2×117772213345981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117772213345901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58886106672990 + 58886106672991.

It is an arithmetic number, because the mean of its divisors is an integer number (58886106672991).

Almost surely, 2^{117772213345981} is an apocalyptic number.

It is an amenable number.

117772213345981 is a deficient number, since it is larger than the sum of its proper divisors (1).

117772213345981 is an equidigital number, since it uses as much as digits as its factorization.

117772213345981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 61.

The spelling of 117772213345981 in words is "one hundred seventeen trillion, seven hundred seventy-two billion, two hundred thirteen million, three hundred forty-five thousand, nine hundred eighty-one".