381138377555 has 16 divisors (see below), whose sum is σ = 494608947840. Its totient is φ = 280278380928.

The previous prime is 381138377513. The next prime is 381138377569. The reversal of 381138377555 is 555773831183.

It is not a de Polignac number, because 381138377555 - 2²⁸ = 380869942099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381138377555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12251552 + ... + 12282621.

It is an arithmetic number, because the mean of its divisors is an integer number (30913059240).

Almost surely, 2^381138377555 is an apocalyptic number.

381138377555 is a deficient number, since it is larger than the sum of its proper divisors (113470570285).

381138377555 is a wasteful number, since it uses less digits than its factorization.

381138377555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24534430.

The product of its digits is 10584000, while the sum is 56.

The spelling of 381138377555 in words is "three hundred eighty-one billion, one hundred thirty-eight million, three hundred seventy-seven thousand, five hundred fifty-five".