55595551 has 16 divisors (see below), whose sum is σ = 61826688. Its totient is φ = 49572000.

The previous prime is 55595543. The next prime is 55595563. The reversal of 55595551 is 15559555.

55595551 = T₈₈ + T₈₉ + ... + T₆₉₃.

It is a cyclic number.

It is not a de Polignac number, because 55595551 - 2³ = 55595543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55595521) 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, 180940 + ... + 181246.

It is an arithmetic number, because the mean of its divisors is an integer number (3864168).

Almost surely, 2^55595551 is an apocalyptic number.

55595551 is a deficient number, since it is larger than the sum of its proper divisors (6231137).

55595551 is a wasteful number, since it uses less digits than its factorization.

55595551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582.

The product of its digits is 140625, while the sum is 40.

The square root of 55595551 is about 7456.2424182694. The cubic root of 55595551 is about 381.6629589295.

The spelling of 55595551 in words is "fifty-five million, five hundred ninety-five thousand, five hundred fifty-one".