368181779921 has 2 divisors, whose sum is σ = 368181779922. Its totient is φ = 368181779920.

The previous prime is 368181779887. The next prime is 368181779947. The reversal of 368181779921 is 129977181863.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368162551696 + 19228225 = 606764^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 368181779921 - 2¹⁸ = 368181517777 is a prime.

It is not a weakly prime, because it can be changed into another prime (368181779951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 184090889960 + 184090889961.

It is an arithmetic number, because the mean of its divisors is an integer number (184090889961).

Almost surely, 2^368181779921 is an apocalyptic number.

It is an amenable number.

368181779921 is a deficient number, since it is larger than the sum of its proper divisors (1).

368181779921 is an equidigital number, since it uses as much as digits as its factorization.

368181779921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 62.

The spelling of 368181779921 in words is "three hundred sixty-eight billion, one hundred eighty-one million, seven hundred seventy-nine thousand, nine hundred twenty-one".