2155551211613 has 8 divisors (see below), whose sum is σ = 2165392658688. Its totient is φ = 2145711330144.

The previous prime is 2155551211577. The next prime is 2155551211633. The reversal of 2155551211613 is 3161121555512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155551211613 - 2¹⁸ = 2155550949469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155551211633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2414306 + ... + 3184332.

It is an arithmetic number, because the mean of its divisors is an integer number (270674082336).

Almost surely, 2^{2155551211613} is an apocalyptic number.

It is an amenable number.

2155551211613 is a deficient number, since it is larger than the sum of its proper divisors (9841447075).

2155551211613 is a wasteful number, since it uses less digits than its factorization.

2155551211613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782803.

The product of its digits is 45000, while the sum is 38.

The spelling of 2155551211613 in words is "two trillion, one hundred fifty-five billion, five hundred fifty-one million, two hundred eleven thousand, six hundred thirteen".