2166551157017 has 4 divisors (see below), whose sum is σ = 2333208938340. Its totient is φ = 1999893375696.

The previous prime is 2166551156999. The next prime is 2166551157061. The reversal of 2166551157017 is 7107511556612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85467937801 + 2081083219216 = 292349^2 + 1442596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166551157017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166551157077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83328890642 + ... + 83328890667.

It is an arithmetic number, because the mean of its divisors is an integer number (583302234585).

Almost surely, 2^{2166551157017} is an apocalyptic number.

It is an amenable number.

2166551157017 is a deficient number, since it is larger than the sum of its proper divisors (166657781323).

2166551157017 is a wasteful number, since it uses less digits than its factorization.

2166551157017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166657781322.

The product of its (nonzero) digits is 441000, while the sum is 47.

The spelling of 2166551157017 in words is "two trillion, one hundred sixty-six billion, five hundred fifty-one million, one hundred fifty-seven thousand, seventeen".