55215515061617 has 16 divisors (see below), whose sum is σ = 57296753889408. Its totient is φ = 53170547458560.

The previous prime is 55215515061613. The next prime is 55215515061661. The reversal of 55215515061617 is 71616051551255.

It is a cyclic number.

It is not a de Polignac number, because 55215515061617 - 2² = 55215515061613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215515061613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140648033 + ... + 141040065.

It is an arithmetic number, because the mean of its divisors is an integer number (3581047118088).

Almost surely, 2^{55215515061617} is an apocalyptic number.

It is an amenable number.

55215515061617 is a deficient number, since it is larger than the sum of its proper divisors (2081238827791).

55215515061617 is a wasteful number, since it uses less digits than its factorization.

55215515061617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438280.

The product of its (nonzero) digits is 1575000, while the sum is 50.

The spelling of 55215515061617 in words is "fifty-five trillion, two hundred fifteen billion, five hundred fifteen million, sixty-one thousand, six hundred seventeen".