864505894157 has 4 divisors (see below), whose sum is σ = 864509753436. Its totient is φ = 864502034880.

The previous prime is 864505894139. The next prime is 864505894159. The reversal of 864505894157 is 751498505468.

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 3867471721 + 860638422436 = 62189^2 + 927706^2 .

It is a cyclic number.

It is not a de Polignac number, because 864505894157 - 2¹⁰ = 864505893133 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 864505894157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864505894159) 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, 1571468 + ... + 2049029.

It is an arithmetic number, because the mean of its divisors is an integer number (216127438359).

Almost surely, 2^864505894157 is an apocalyptic number.

It is an amenable number.

864505894157 is a deficient number, since it is larger than the sum of its proper divisors (3859279).

864505894157 is a wasteful number, since it uses less digits than its factorization.

864505894157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859278.

The product of its (nonzero) digits is 48384000, while the sum is 62.

The spelling of 864505894157 in words is "eight hundred sixty-four billion, five hundred five million, eight hundred ninety-four thousand, one hundred fifty-seven".