2154123526466 has 32 divisors (see below), whose sum is σ = 3307298351040. Its totient is φ = 1051879922496.

The previous prime is 2154123526439. The next prime is 2154123526547. The reversal of 2154123526466 is 6646253214512.

It is a self number, because there is not a number n which added to its sum of digits gives 2154123526466.

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, 147263045 + ... + 147277671.

It is an arithmetic number, because the mean of its divisors is an integer number (103353073470).

Almost surely, 2^{2154123526466} is an apocalyptic number.

2154123526466 is a deficient number, since it is larger than the sum of its proper divisors (1153174824574).

2154123526466 is a wasteful number, since it uses less digits than its factorization.

2154123526466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20978.

The product of its digits is 2073600, while the sum is 47.

The spelling of 2154123526466 in words is "two trillion, one hundred fifty-four billion, one hundred twenty-three million, five hundred twenty-six thousand, four hundred sixty-six".