38556918777557 has 2 divisors, whose sum is σ = 38556918777558. Its totient is φ = 38556918777556.

The previous prime is 38556918777511. The next prime is 38556918777691. The reversal of 38556918777557 is 75577781965583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31647217843396 + 6909700934161 = 5625586^2 + 2628631^2 .

It is an emirp because it is prime and its reverse (75577781965583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38556918777557 - 2³⁰ = 38555845035733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38556918774557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19278459388778 + 19278459388779.

It is an arithmetic number, because the mean of its divisors is an integer number (19278459388779).

Almost surely, 2^{38556918777557} is an apocalyptic number.

It is an amenable number.

38556918777557 is a deficient number, since it is larger than the sum of its proper divisors (1).

38556918777557 is an equidigital number, since it uses as much as digits as its factorization.

38556918777557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15558480000, while the sum is 83.

The spelling of 38556918777557 in words is "thirty-eight trillion, five hundred fifty-six billion, nine hundred eighteen million, seven hundred seventy-seven thousand, five hundred fifty-seven".