2115812748538 has 4 divisors (see below), whose sum is σ = 3173719122810. Its totient is φ = 1057906374268.

The previous prime is 2115812748529. The next prime is 2115812748571. The reversal of 2115812748538 is 8358472185112.

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

It can be written as a sum of positive squares in only one way, i.e., 2108527613929 + 7285134609 = 1452077^2 + 85353^2 .

It is a super-2 number, since 2×2115812748538² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528953187133 + ... + 528953187136.

Almost surely, 2^{2115812748538} is an apocalyptic number.

2115812748538 is a deficient number, since it is larger than the sum of its proper divisors (1057906374272).

2115812748538 is a wasteful number, since it uses less digits than its factorization.

2115812748538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057906374271.

The product of its digits is 4300800, while the sum is 55.

The spelling of 2115812748538 in words is "two trillion, one hundred fifteen billion, eight hundred twelve million, seven hundred forty-eight thousand, five hundred thirty-eight".