38775128915 has 4 divisors (see below), whose sum is σ = 46530154704. Its totient is φ = 31020103128.

The previous prime is 38775128897. The next prime is 38775128923. The reversal of 38775128915 is 51982157783.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38775128915 - 2¹⁰ = 38775127891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3877512887 + ... + 3877512896.

It is an arithmetic number, because the mean of its divisors is an integer number (11632538676).

Almost surely, 2^38775128915 is an apocalyptic number.

38775128915 is a deficient number, since it is larger than the sum of its proper divisors (7755025789).

38775128915 is an equidigital number, since it uses as much as digits as its factorization.

38775128915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7755025788.

The product of its digits is 4233600, while the sum is 56.

The spelling of 38775128915 in words is "thirty-eight billion, seven hundred seventy-five million, one hundred twenty-eight thousand, nine hundred fifteen".