1338780172555 has 32 divisors (see below), whose sum is σ = 1932975567360. Its totient is φ = 869568618240.

The previous prime is 1338780172519. The next prime is 1338780172567. The reversal of 1338780172555 is 5552710878331.

It is not a de Polignac number, because 1338780172555 - 2¹⁷ = 1338780041483 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1338780172496 and 1338780172505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4216527 + ... + 4522903.

It is an arithmetic number, because the mean of its divisors is an integer number (60405486480).

Almost surely, 2^{1338780172555} is an apocalyptic number.

1338780172555 is a deficient number, since it is larger than the sum of its proper divisors (594195394805).

1338780172555 is a wasteful number, since it uses less digits than its factorization.

1338780172555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312979.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 1338780172555 in words is "one trillion, three hundred thirty-eight billion, seven hundred eighty million, one hundred seventy-two thousand, five hundred fifty-five".