877423163821 has 4 divisors (see below), whose sum is σ = 877425041500. Its totient is φ = 877421286144.

The previous prime is 877423163797. The next prime is 877423163863. The reversal of 877423163821 is 128361324778.

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

It can be written as a sum of positive squares in 2 ways, for example, as 511868702500 + 365554461321 = 715450^2 + 604611^2 .

It is a cyclic number.

It is not a de Polignac number, because 877423163821 - 2⁵ = 877423163789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877423163921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374605 + ... + 1376653.

It is an arithmetic number, because the mean of its divisors is an integer number (219356260375).

Almost surely, 2^877423163821 is an apocalyptic number.

It is an amenable number.

877423163821 is a deficient number, since it is larger than the sum of its proper divisors (1877679).

877423163821 is a wasteful number, since it uses less digits than its factorization.

877423163821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877678.

The product of its digits is 2709504, while the sum is 52.

The spelling of 877423163821 in words is "eight hundred seventy-seven billion, four hundred twenty-three million, one hundred sixty-three thousand, eight hundred twenty-one".