551969965 has 4 divisors (see below), whose sum is σ = 662363964. Its totient is φ = 441575968.

The previous prime is 551969947. The next prime is 551969989. The reversal of 551969965 is 569969155.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 207273609 + 344696356 = 14397^2 + 18566^2 .

It is a cyclic number.

It is not a de Polignac number, because 551969965 - 2⁵ = 551969933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55196992 + ... + 55197001.

It is an arithmetic number, because the mean of its divisors is an integer number (165590991).

Almost surely, 2^551969965 is an apocalyptic number.

It is an amenable number.

551969965 is a deficient number, since it is larger than the sum of its proper divisors (110393999).

551969965 is a wasteful number, since it uses less digits than its factorization.

551969965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110393998.

The product of its digits is 3280500, while the sum is 55.

The square root of 551969965 is about 23494.0410529989. The cubic root of 551969965 is about 820.2983075870.

The spelling of 551969965 in words is "five hundred fifty-one million, nine hundred sixty-nine thousand, nine hundred sixty-five".