8213637457 has 4 divisors (see below), whose sum is σ = 8478593536. Its totient is φ = 7948681380.

The previous prime is 8213637449. The next prime is 8213637473. The reversal of 8213637457 is 7547363128.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8213637457 - 2³ = 8213637449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213637407) 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, 132477993 + ... + 132478054.

It is an arithmetic number, because the mean of its divisors is an integer number (2119648384).

Almost surely, 2^8213637457 is an apocalyptic number.

It is an amenable number.

8213637457 is a deficient number, since it is larger than the sum of its proper divisors (264956079).

8213637457 is a wasteful number, since it uses less digits than its factorization.

8213637457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264956078.

The product of its digits is 846720, while the sum is 46.

The square root of 8213637457 is about 90629.1203587456. The cubic root of 8213637457 is about 2017.6469559292.

The spelling of 8213637457 in words is "eight billion, two hundred thirteen million, six hundred thirty-seven thousand, four hundred fifty-seven".