551166561651 has 4 divisors (see below), whose sum is σ = 734888748872. Its totient is φ = 367444374432.

The previous prime is 551166561643. The next prime is 551166561653. The reversal of 551166561651 is 156165661155.

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

It is not a de Polignac number, because 551166561651 - 2³ = 551166561643 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 551166561651.

It is not an unprimeable number, because it can be changed into a prime (551166561653) 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, 91861093606 + ... + 91861093611.

It is an arithmetic number, because the mean of its divisors is an integer number (183722187218).

Almost surely, 2^551166561651 is an apocalyptic number.

551166561651 is a deficient number, since it is larger than the sum of its proper divisors (183722187221).

551166561651 is a wasteful number, since it uses less digits than its factorization.

551166561651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183722187220.

The product of its digits is 810000, while the sum is 48.

The spelling of 551166561651 in words is "five hundred fifty-one billion, one hundred sixty-six million, five hundred sixty-one thousand, six hundred fifty-one".