551634131661 has 8 divisors (see below), whose sum is σ = 760874664480. Its totient is φ = 355074843312.

The previous prime is 551634131647. The next prime is 551634131677. The reversal of 551634131661 is 166131436155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551634131661 - 2⁶ = 551634131597 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551634131611) 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, 3170311015 + ... + 3170311188.

It is an arithmetic number, because the mean of its divisors is an integer number (95109333060).

Almost surely, 2^551634131661 is an apocalyptic number.

It is an amenable number.

551634131661 is a deficient number, since it is larger than the sum of its proper divisors (209240532819).

551634131661 is a wasteful number, since it uses less digits than its factorization.

551634131661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340622235.

The product of its digits is 194400, while the sum is 42.

The spelling of 551634131661 in words is "five hundred fifty-one billion, six hundred thirty-four million, one hundred thirty-one thousand, six hundred sixty-one".