55564739 has 2 divisors, whose sum is σ = 55564740. Its totient is φ = 55564738.

The previous prime is 55564727. The next prime is 55564793. The reversal of 55564739 is 93746555.

Together with next prime (55564793) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55564739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55564739.

It is not a weakly prime, because it can be changed into another prime (55564709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27782369 + 27782370.

It is an arithmetic number, because the mean of its divisors is an integer number (27782370).

Almost surely, 2^55564739 is an apocalyptic number.

55564739 is a deficient number, since it is larger than the sum of its proper divisors (1).

55564739 is an equidigital number, since it uses as much as digits as its factorization.

55564739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 44.

The square root of 55564739 is about 7454.1759437244. The cubic root of 55564739 is about 381.5924378654.

The spelling of 55564739 in words is "fifty-five million, five hundred sixty-four thousand, seven hundred thirty-nine".