811773913000 has 32 divisors (see below), whose sum is σ = 1899550958760. Its totient is φ = 324709564800.

The previous prime is 811773912977. The next prime is 811773913007. The reversal of 811773913000 is 319377118.

It can be written as a sum of positive squares in 4 ways, for example, as 306767545956 + 505006367044 = 553866^2 + 710638^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (811773913007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405885957 + ... + 405887956.

Almost surely, 2^811773913000 is an apocalyptic number.

It is an amenable number.

811773913000 is an abundant number, since it is smaller than the sum of its proper divisors (1087777045760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811773913000 is a wasteful number, since it uses less digits than its factorization.

811773913000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811773934 (or 811773920 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 811773913000 in words is "eight hundred eleven billion, seven hundred seventy-three million, nine hundred thirteen thousand".