66925577 has 2 divisors, whose sum is σ = 66925578. Its totient is φ = 66925576.

The previous prime is 66925541. The next prime is 66925609. The reversal of 66925577 is 77552966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42758521 + 24167056 = 6539^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 66925577 - 2⁶ = 66925513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66921577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33462788 + 33462789.

It is an arithmetic number, because the mean of its divisors is an integer number (33462789).

Almost surely, 2^66925577 is an apocalyptic number.

It is an amenable number.

66925577 is a deficient number, since it is larger than the sum of its proper divisors (1).

66925577 is an equidigital number, since it uses as much as digits as its factorization.

66925577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The square root of 66925577 is about 8180.8054004481. The cubic root of 66925577 is about 406.0043699530.

The spelling of 66925577 in words is "sixty-six million, nine hundred twenty-five thousand, five hundred seventy-seven".