6665166451 has 2 divisors, whose sum is σ = 6665166452. Its totient is φ = 6665166450.

The previous prime is 6665166449. The next prime is 6665166461. The reversal of 6665166451 is 1546615666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6665166451 - 2¹ = 6665166449 is a prime.

Together with 6665166449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6665166401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332583225 + 3332583226.

It is an arithmetic number, because the mean of its divisors is an integer number (3332583226).

Almost surely, 2^6665166451 is an apocalyptic number.

6665166451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665166451 is an equidigital number, since it uses as much as digits as its factorization.

6665166451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 46.

The square root of 6665166451 is about 81640.4706686580. The cubic root of 6665166451 is about 1881.9308714717.

The spelling of 6665166451 in words is "six billion, six hundred sixty-five million, one hundred sixty-six thousand, four hundred fifty-one".