55051615 has 4 divisors (see below), whose sum is σ = 66061944. Its totient is φ = 44041288.

The previous prime is 55051603. The next prime is 55051631. The reversal of 55051615 is 51615055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51615055 = 5 ⋅10323011.

It is a cyclic number.

It is not a de Polignac number, because 55051615 - 2⁵ = 55051583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505157 + ... + 5505166.

It is an arithmetic number, because the mean of its divisors is an integer number (16515486).

Almost surely, 2^55051615 is an apocalyptic number.

55051615 is a deficient number, since it is larger than the sum of its proper divisors (11010329).

55051615 is a wasteful number, since it uses less digits than its factorization.

55051615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010328.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 55051615 is about 7419.6775536407. The cubic root of 55051615 is about 380.4141721491.

The spelling of 55051615 in words is "fifty-five million, fifty-one thousand, six hundred fifteen".