551085996691 has 4 divisors (see below), whose sum is σ = 551107657984. Its totient is φ = 551064335400.

The previous prime is 551085996667. The next prime is 551085996707. The reversal of 551085996691 is 196699580155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551085996691 - 2²³ = 551077608083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551085996631) 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, 10792440 + ... + 10843381.

It is an arithmetic number, because the mean of its divisors is an integer number (137776914496).

Almost surely, 2^551085996691 is an apocalyptic number.

551085996691 is a deficient number, since it is larger than the sum of its proper divisors (21661293).

551085996691 is a wasteful number, since it uses less digits than its factorization.

551085996691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21661292.

The product of its (nonzero) digits is 26244000, while the sum is 64.

The spelling of 551085996691 in words is "five hundred fifty-one billion, eighty-five million, nine hundred ninety-six thousand, six hundred ninety-one".