83415215857 has 4 divisors (see below), whose sum is σ = 83424479860. Its totient is φ = 83405951856.

The previous prime is 83415215843. The next prime is 83415215867. The reversal of 83415215857 is 75851251438.

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 69339528976 + 14075686881 = 263324^2 + 118641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83415215857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83415215857.

It is not an unprimeable number, because it can be changed into a prime (83415215867) 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, 4618482 + ... + 4636507.

It is an arithmetic number, because the mean of its divisors is an integer number (20856119965).

Almost surely, 2^83415215857 is an apocalyptic number.

It is an amenable number.

83415215857 is a deficient number, since it is larger than the sum of its proper divisors (9264003).

83415215857 is an equidigital number, since it uses as much as digits as its factorization.

83415215857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264002.

The product of its digits is 1344000, while the sum is 49.

The spelling of 83415215857 in words is "eighty-three billion, four hundred fifteen million, two hundred fifteen thousand, eight hundred fifty-seven".