55015668 has 36 divisors (see below), whose sum is σ = 143865540. Its totient is φ = 17705856.

The previous prime is 55015663. The next prime is 55015711. The reversal of 55015668 is 86651055.

It can be written as a sum of positive squares in 2 ways, for example, as 44595684 + 10419984 = 6678^2 + 3228^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55015663) 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, 25305 + ... + 27392.

It is an arithmetic number, because the mean of its divisors is an integer number (3996265).

Almost surely, 2^55015668 is an apocalyptic number.

55015668 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

55015668 is an abundant number, since it is smaller than the sum of its proper divisors (88849872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55015668 is a wasteful number, since it uses less digits than its factorization.

55015668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52736 (or 52731 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 55015668 is about 7417.2547482205. The cubic root of 55015668 is about 380.3313545622.

The spelling of 55015668 in words is "fifty-five million, fifteen thousand, six hundred sixty-eight".