2166520547 has 2 divisors, whose sum is σ = 2166520548. Its totient is φ = 2166520546.

The previous prime is 2166520501. The next prime is 2166520549. The reversal of 2166520547 is 7450256612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166520547 - 2²⁴ = 2149743331 is a prime.

It is a super-2 number, since 2×2166520547² = 9387622561146358418, which contains 22 as substring.

Together with 2166520549, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2166520547.

It is not a weakly prime, because it can be changed into another prime (2166520549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083260273 + 1083260274.

It is an arithmetic number, because the mean of its divisors is an integer number (1083260274).

Almost surely, 2^2166520547 is an apocalyptic number.

2166520547 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166520547 is an equidigital number, since it uses as much as digits as its factorization.

2166520547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 2166520547 is about 46545.8972090989. The cubic root of 2166520547 is about 1293.9602566413.

The spelling of 2166520547 in words is "two billion, one hundred sixty-six million, five hundred twenty thousand, five hundred forty-seven".