551000566691 has 4 divisors (see below), whose sum is σ = 551415790752. Its totient is φ = 550585342632.

The previous prime is 551000566687. The next prime is 551000566703. The reversal of 551000566691 is 196665000155.

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 551000566691 - 2² = 551000566687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551000566601) 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, 207610040 + ... + 207612693.

It is an arithmetic number, because the mean of its divisors is an integer number (137853947688).

Almost surely, 2^551000566691 is an apocalyptic number.

551000566691 is a deficient number, since it is larger than the sum of its proper divisors (415224061).

551000566691 is a wasteful number, since it uses less digits than its factorization.

551000566691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415224060.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 551000566691 in words is "five hundred fifty-one billion, five hundred sixty-six thousand, six hundred ninety-one".