636045245151557 has 4 divisors (see below), whose sum is σ = 638077338586860. Its totient is φ = 634013151716256.

The previous prime is 636045245151517. The next prime is 636045245151577. The reversal of 636045245151557 is 755151542540636.

It is a happy number.

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 58827273971236 + 577217971180321 = 7669894^2 + 24025361^2 .

It is a cyclic number.

It is not a de Polignac number, because 636045245151557 - 2¹⁶ = 636045245086021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636045245151496 and 636045245151505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636045245151517) 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, 1016046717182 + ... + 1016046717807.

It is an arithmetic number, because the mean of its divisors is an integer number (159519334646715).

Almost surely, 2^{636045245151557} is an apocalyptic number.

It is an amenable number.

636045245151557 is a deficient number, since it is larger than the sum of its proper divisors (2032093435303).

636045245151557 is a wasteful number, since it uses less digits than its factorization.

636045245151557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032093435302.

The product of its (nonzero) digits is 75600000, while the sum is 59.

The spelling of 636045245151557 in words is "six hundred thirty-six trillion, forty-five billion, two hundred forty-five million, one hundred fifty-one thousand, five hundred fifty-seven".