2151666517 has 16 divisors (see below), whose sum is σ = 2888952192. Its totient is φ = 1547651520.

The previous prime is 2151666509. The next prime is 2151666521. The reversal of 2151666517 is 7156661512.

2151666517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2151666517 - 2³ = 2151666509 is a prime.

It is a super-2 number, since 2×2151666517² = 9259337600757822578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151666517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151666527) 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, 1073758 + ... + 1075759.

It is an arithmetic number, because the mean of its divisors is an integer number (180559512).

Almost surely, 2^2151666517 is an apocalyptic number.

It is an amenable number.

2151666517 is a deficient number, since it is larger than the sum of its proper divisors (737285675).

2151666517 is a wasteful number, since it uses less digits than its factorization.

2151666517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149548.

The product of its digits is 75600, while the sum is 40.

The square root of 2151666517 is about 46386.0595114524. The cubic root of 2151666517 is about 1290.9962692213.

The spelling of 2151666517 in words is "two billion, one hundred fifty-one million, six hundred sixty-six thousand, five hundred seventeen".