66402851 has 2 divisors, whose sum is σ = 66402852. Its totient is φ = 66402850.

The previous prime is 66402823. The next prime is 66402857. The reversal of 66402851 is 15820466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66402851 - 2¹⁸ = 66140707 is a prime.

It is not a weakly prime, because it can be changed into another prime (66402857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201425 + 33201426.

It is an arithmetic number, because the mean of its divisors is an integer number (33201426).

Almost surely, 2^66402851 is an apocalyptic number.

66402851 is a deficient number, since it is larger than the sum of its proper divisors (1).

66402851 is an equidigital number, since it uses as much as digits as its factorization.

66402851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 66402851 is about 8148.7944507148. The cubic root of 66402851 is about 404.9445659027.

The spelling of 66402851 in words is "sixty-six million, four hundred two thousand, eight hundred fifty-one".