5166165521 has 16 divisors (see below), whose sum is σ = 5700154560. Its totient is φ = 4643205120.

The previous prime is 5166165503. The next prime is 5166165523. The reversal of 5166165521 is 1255616615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5166165521 - 2¹⁴ = 5166149137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5166165523) 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, 338585 + ... + 353513.

It is an arithmetic number, because the mean of its divisors is an integer number (356259660).

Almost surely, 2^5166165521 is an apocalyptic number.

It is an amenable number.

5166165521 is a deficient number, since it is larger than the sum of its proper divisors (533989039).

5166165521 is a wasteful number, since it uses less digits than its factorization.

5166165521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15296.

The product of its digits is 54000, while the sum is 38.

The square root of 5166165521 is about 71876.0427472186. The cubic root of 5166165521 is about 1728.7124995704.

The spelling of 5166165521 in words is "five billion, one hundred sixty-six million, one hundred sixty-five thousand, five hundred twenty-one".