55699639 has 2 divisors, whose sum is σ = 55699640. Its totient is φ = 55699638.

The previous prime is 55699597. The next prime is 55699703. The reversal of 55699639 is 93699655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55699639 - 2²¹ = 53602487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55649639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27849819 + 27849820.

It is an arithmetic number, because the mean of its divisors is an integer number (27849820).

Almost surely, 2^55699639 is an apocalyptic number.

55699639 is a deficient number, since it is larger than the sum of its proper divisors (1).

55699639 is an equidigital number, since it uses as much as digits as its factorization.

55699639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1968300, while the sum is 52.

The square root of 55699639 is about 7463.2190775831. The cubic root of 55699639 is about 381.9009981648.

The spelling of 55699639 in words is "fifty-five million, six hundred ninety-nine thousand, six hundred thirty-nine".