66676501 has 2 divisors, whose sum is σ = 66676502. Its totient is φ = 66676500.

The previous prime is 66676469. The next prime is 66676507. The reversal of 66676501 is 10567666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 904401 = 8110^2 + 951^2 .

It is a cyclic number.

It is not a de Polignac number, because 66676501 - 2⁵ = 66676469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66676507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33338250 + 33338251.

It is an arithmetic number, because the mean of its divisors is an integer number (33338251).

Almost surely, 2^66676501 is an apocalyptic number.

It is an amenable number.

66676501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66676501 is an equidigital number, since it uses as much as digits as its factorization.

66676501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66676501 is about 8165.5680145352. The cubic root of 66676501 is about 405.5000701919.

The spelling of 66676501 in words is "sixty-six million, six hundred seventy-six thousand, five hundred one".