800157572661 has 4 divisors (see below), whose sum is σ = 1066876763552. Its totient is φ = 533438381772.

The previous prime is 800157572659. The next prime is 800157572671. The reversal of 800157572661 is 166275751008.

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 not a de Polignac number, because 800157572661 - 2¹ = 800157572659 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 800157572661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800157572671) 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, 133359595441 + ... + 133359595446.

It is an arithmetic number, because the mean of its divisors is an integer number (266719190888).

Almost surely, 2^800157572661 is an apocalyptic number.

It is an amenable number.

800157572661 is a deficient number, since it is larger than the sum of its proper divisors (266719190891).

800157572661 is a wasteful number, since it uses less digits than its factorization.

800157572661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266719190890.

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 800157572661 in words is "eight hundred billion, one hundred fifty-seven million, five hundred seventy-two thousand, six hundred sixty-one".