66976511 has 4 divisors (see below), whose sum is σ = 76544592. Its totient is φ = 57408432.

The previous prime is 66976477. The next prime is 66976541. The reversal of 66976511 is 11567966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11567966 = 2 ⋅5783983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66976511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4784030 + ... + 4784043.

It is an arithmetic number, because the mean of its divisors is an integer number (19136148).

Almost surely, 2^66976511 is an apocalyptic number.

66976511 is a deficient number, since it is larger than the sum of its proper divisors (9568081).

66976511 is an equidigital number, since it uses as much as digits as its factorization.

66976511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568080.

The product of its digits is 68040, while the sum is 41.

The square root of 66976511 is about 8183.9178270557. The cubic root of 66976511 is about 406.1073409629.

The spelling of 66976511 in words is "sixty-six million, nine hundred seventy-six thousand, five hundred eleven".