388635775081 has 4 divisors (see below), whose sum is σ = 394109518464. Its totient is φ = 383162031700.

The previous prime is 388635775039. The next prime is 388635775109. The reversal of 388635775081 is 180577536883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 388635775081 - 2³⁵ = 354276036713 is a prime.

It is a super-2 number, since 2×388635775081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388635775001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2736871585 + ... + 2736871726.

It is an arithmetic number, because the mean of its divisors is an integer number (98527379616).

Almost surely, 2^388635775081 is an apocalyptic number.

It is an amenable number.

388635775081 is a deficient number, since it is larger than the sum of its proper divisors (5473743383).

388635775081 is an equidigital number, since it uses as much as digits as its factorization.

388635775081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473743382.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 388635775081 in words is "three hundred eighty-eight billion, six hundred thirty-five million, seven hundred seventy-five thousand, eighty-one".