2115551123464 has 8 divisors (see below), whose sum is σ = 3966658356510. Its totient is φ = 1057775561728.

The previous prime is 2115551123453. The next prime is 2115551123473. The reversal of 2115551123464 is 4643211555112.

It can be written as a sum of positive squares in only one way, i.e., 2059827744100 + 55723379364 = 1435210^2 + 236058^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132221945209 + ... + 132221945224.

Almost surely, 2^{2115551123464} is an apocalyptic number.

It is an amenable number.

2115551123464 is a deficient number, since it is larger than the sum of its proper divisors (1851107233046).

2115551123464 is a wasteful number, since it uses less digits than its factorization.

2115551123464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264443890439 (or 264443890435 counting only the distinct ones).

The product of its digits is 144000, while the sum is 40.

Adding to 2115551123464 its reverse (4643211555112), we get a palindrome (6758762678576).

The spelling of 2115551123464 in words is "two trillion, one hundred fifteen billion, five hundred fifty-one million, one hundred twenty-three thousand, four hundred sixty-four".