55308623 has 2 divisors, whose sum is σ = 55308624. Its totient is φ = 55308622.

The previous prime is 55308587. The next prime is 55308653. The reversal of 55308623 is 32680355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55308623 - 2¹⁸ = 55046479 is a prime.

It is a super-2 number, since 2×55308623² = 6118087556312258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55308623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55308653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27654311 + 27654312.

It is an arithmetic number, because the mean of its divisors is an integer number (27654312).

Almost surely, 2^55308623 is an apocalyptic number.

55308623 is a deficient number, since it is larger than the sum of its proper divisors (1).

55308623 is an equidigital number, since it uses as much as digits as its factorization.

55308623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 55308623 is about 7436.9767378956. The cubic root of 55308623 is about 381.0052400866.

Adding to 55308623 its reverse (32680355), we get a palindrome (87988978).

The spelling of 55308623 in words is "fifty-five million, three hundred eight thousand, six hundred twenty-three".