55515515 has 8 divisors (see below), whose sum is σ = 72674928. Its totient is φ = 40374880.

The previous prime is 55515497. The next prime is 55515529. The reversal of 55515515 is 51551555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55515515 - 2¹⁰ = 55514491 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504632 + ... + 504741.

It is an arithmetic number, because the mean of its divisors is an integer number (9084366).

Almost surely, 2^55515515 is an apocalyptic number.

55515515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55515515 is a deficient number, since it is larger than the sum of its proper divisors (17159413).

55515515 is a wasteful number, since it uses less digits than its factorization.

55515515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009389.

The product of its digits is 15625, while the sum is 32.

The square root of 55515515 is about 7450.8734387319. The cubic root of 55515515 is about 381.4797221641.

The spelling of 55515515 in words is "fifty-five million, five hundred fifteen thousand, five hundred fifteen".