2166520505 has 8 divisors (see below), whose sum is σ = 2736657600. Its totient is φ = 1641994416.

The previous prime is 2166520501. The next prime is 2166520547. The reversal of 2166520505 is 5050256612.

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 2166520505 - 2² = 2166520501 is a prime.

It is a super-2 number, since 2×2166520505² = 9387622197170910050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2166520501) 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, 11402645 + ... + 11402834.

It is an arithmetic number, because the mean of its divisors is an integer number (342082200).

Almost surely, 2^2166520505 is an apocalyptic number.

It is an amenable number.

2166520505 is a deficient number, since it is larger than the sum of its proper divisors (570137095).

2166520505 is a wasteful number, since it uses less digits than its factorization.

2166520505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22805503.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 2166520505 is about 46545.8967579313. The cubic root of 2166520505 is about 1293.9602482798.

The spelling of 2166520505 in words is "two billion, one hundred sixty-six million, five hundred twenty thousand, five hundred five".