55623505 has 16 divisors (see below), whose sum is σ = 77253120. Its totient is φ = 37657152.

The previous prime is 55623461. The next prime is 55623509. The reversal of 55623505 is 50532655.

It is a cyclic number.

It is not a de Polignac number, because 55623505 - 2¹⁵ = 55590737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55623509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7294 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (4828320).

Almost surely, 2^55623505 is an apocalyptic number.

It is an amenable number.

55623505 is a deficient number, since it is larger than the sum of its proper divisors (21629615).

55623505 is a wasteful number, since it uses less digits than its factorization.

55623505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20208.

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 55623505 is about 7458.1167193870. The cubic root of 55623505 is about 381.7269161977.

The spelling of 55623505 in words is "fifty-five million, six hundred twenty-three thousand, five hundred five".