66976751 has 4 divisors (see below), whose sum is σ = 67976472. Its totient is φ = 65977032.

The previous prime is 66976717. The next prime is 66976769. The reversal of 66976751 is 15767966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15767966 = 2 ⋅7883983.

It is a cyclic number.

It is not a de Polignac number, because 66976751 - 2⁶ = 66976687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66976696 and 66976705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976451) 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, 499760 + ... + 499893.

It is an arithmetic number, because the mean of its divisors is an integer number (16994118).

Almost surely, 2^66976751 is an apocalyptic number.

66976751 is a deficient number, since it is larger than the sum of its proper divisors (999721).

66976751 is an equidigital number, since it uses as much as digits as its factorization.

66976751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999720.

The product of its digits is 476280, while the sum is 47.

The square root of 66976751 is about 8183.9324899464. The cubic root of 66976751 is about 406.1078260366.

The spelling of 66976751 in words is "sixty-six million, nine hundred seventy-six thousand, seven hundred fifty-one".