55515015 has 24 divisors (see below), whose sum is σ = 96429840. Its totient is φ = 29545344.

The previous prime is 55515011. The next prime is 55515023. The reversal of 55515015 is 51051555.

It is not a de Polignac number, because 55515015 - 2² = 55515011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55515015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55515011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26859 + ... + 28851.

It is an arithmetic number, because the mean of its divisors is an integer number (4017910).

Almost surely, 2^55515015 is an apocalyptic number.

55515015 is a deficient number, since it is larger than the sum of its proper divisors (40914825).

55515015 is a wasteful number, since it uses less digits than its factorization.

55515015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623 (or 2620 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 27.

The square root of 55515015 is about 7450.8398855431. The cubic root of 55515015 is about 381.4785768960.

The spelling of 55515015 in words is "fifty-five million, five hundred fifteen thousand, fifteen".