38166701813 has 2 divisors, whose sum is σ = 38166701814. Its totient is φ = 38166701812.

The previous prime is 38166701761. The next prime is 38166701879. The reversal of 38166701813 is 31810766183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19090119889 + 19076581924 = 138167^2 + 138118^2 .

It is a cyclic number.

It is not a de Polignac number, because 38166701813 - 2²⁴ = 38149924597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38166704813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19083350906 + 19083350907.

It is an arithmetic number, because the mean of its divisors is an integer number (19083350907).

Almost surely, 2^38166701813 is an apocalyptic number.

It is an amenable number.

38166701813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38166701813 is an equidigital number, since it uses as much as digits as its factorization.

38166701813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

Subtracting from 38166701813 its sum of digits (44), we obtain a square (38166701769 = 195363²).

The spelling of 38166701813 in words is "thirty-eight billion, one hundred sixty-six million, seven hundred one thousand, eight hundred thirteen".