551365665 has 8 divisors (see below), whose sum is σ = 882185088. Its totient is φ = 294061680.

The previous prime is 551365657. The next prime is 551365667. The reversal of 551365665 is 566563155.

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

It is not a de Polignac number, because 551365665 - 2³ = 551365657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551365667) 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, 18378841 + ... + 18378870.

It is an arithmetic number, because the mean of its divisors is an integer number (110273136).

Almost surely, 2^551365665 is an apocalyptic number.

It is an amenable number.

551365665 is a deficient number, since it is larger than the sum of its proper divisors (330819423).

551365665 is a wasteful number, since it uses less digits than its factorization.

551365665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36757719.

The product of its digits is 405000, while the sum is 42.

The square root of 551365665 is about 23481.1768231492. The cubic root of 551365665 is about 819.9988424533.

The spelling of 551365665 in words is "five hundred fifty-one million, three hundred sixty-five thousand, six hundred sixty-five".