5278690661 has 4 divisors (see below), whose sum is σ = 5378288652. Its totient is φ = 5179092672.

The previous prime is 5278690631. The next prime is 5278690667. The reversal of 5278690661 is 1660968725.

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 2786784100 + 2491906561 = 52790^2 + 49919^2 .

It is a cyclic number.

It is not a de Polignac number, because 5278690661 - 2⁶ = 5278690597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5278690667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49798916 + ... + 49799021.

It is an arithmetic number, because the mean of its divisors is an integer number (1344572163).

Almost surely, 2^5278690661 is an apocalyptic number.

It is an amenable number.

5278690661 is a deficient number, since it is larger than the sum of its proper divisors (99597991).

5278690661 is an equidigital number, since it uses as much as digits as its factorization.

5278690661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99597990.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 5278690661 is about 72654.5983472485. The cubic root of 5278690661 is about 1741.1735885217.

The spelling of 5278690661 in words is "five billion, two hundred seventy-eight million, six hundred ninety thousand, six hundred sixty-one".