2178812323497 has 16 divisors (see below), whose sum is σ = 2913785644032. Its totient is φ = 1448196779280.

The previous prime is 2178812323427. The next prime is 2178812323579. The reversal of 2178812323497 is 7943232188712.

It is not a de Polignac number, because 2178812323497 - 2²³ = 2178803934889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2178812323427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528988 + ... + 2153474.

It is an arithmetic number, because the mean of its divisors is an integer number (182111602752).

Almost surely, 2^{2178812323497} is an apocalyptic number.

It is an amenable number.

2178812323497 is a deficient number, since it is larger than the sum of its proper divisors (734973320535).

2178812323497 is a wasteful number, since it uses less digits than its factorization.

2178812323497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625828.

The product of its digits is 8128512, while the sum is 57.

The spelling of 2178812323497 in words is "two trillion, one hundred seventy-eight billion, eight hundred twelve million, three hundred twenty-three thousand, four hundred ninety-seven".