66515051 has 2 divisors, whose sum is σ = 66515052. Its totient is φ = 66515050.

The previous prime is 66515041. The next prime is 66515063. The reversal of 66515051 is 15051566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66515051 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66515021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257525 + 33257526.

It is an arithmetic number, because the mean of its divisors is an integer number (33257526).

Almost surely, 2^66515051 is an apocalyptic number.

66515051 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515051 is an equidigital number, since it uses as much as digits as its factorization.

66515051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66515051 is about 8155.6759989593. The cubic root of 66515051 is about 405.1725140175.

The spelling of 66515051 in words is "sixty-six million, five hundred fifteen thousand, fifty-one".