55131663 has 12 divisors (see below), whose sum is σ = 78088520. Its totient is φ = 34591872.

The previous prime is 55131647. The next prime is 55131679. The reversal of 55131663 is 36613155.

It is an interprime number because it is at equal distance from previous prime (55131647) and next prime (55131679).

It is not a de Polignac number, because 55131663 - 2⁴ = 55131647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55131663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30928 + ... + 32661.

Almost surely, 2^55131663 is an apocalyptic number.

55131663 is a deficient number, since it is larger than the sum of its proper divisors (22956857).

55131663 is a wasteful number, since it uses less digits than its factorization.

55131663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63626 (or 63609 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 55131663 is about 7425.0698986609. The cubic root of 55131663 is about 380.5984637225.

The spelling of 55131663 in words is "fifty-five million, one hundred thirty-one thousand, six hundred sixty-three".