38720801556181 has 2 divisors, whose sum is σ = 38720801556182. Its totient is φ = 38720801556180.

The previous prime is 38720801556167. The next prime is 38720801556193. The reversal of 38720801556181 is 18165510802783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19798005755025 + 18922795801156 = 4449495^2 + 4350034^2 .

It is a cyclic number.

It is not a de Polignac number, because 38720801556181 - 2⁵ = 38720801556149 is a prime.

It is a super-2 number, since 2×38720801556181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38720801556131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360400778090 + 19360400778091.

It is an arithmetic number, because the mean of its divisors is an integer number (19360400778091).

Almost surely, 2^{38720801556181} is an apocalyptic number.

It is an amenable number.

38720801556181 is a deficient number, since it is larger than the sum of its proper divisors (1).

38720801556181 is an equidigital number, since it uses as much as digits as its factorization.

38720801556181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 55.

The spelling of 38720801556181 in words is "thirty-eight trillion, seven hundred twenty billion, eight hundred one million, five hundred fifty-six thousand, one hundred eighty-one".