66526601 has 2 divisors, whose sum is σ = 66526602. Its totient is φ = 66526600.

The previous prime is 66526583. The next prime is 66526613. The reversal of 66526601 is 10662566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49716601 + 16810000 = 7051^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 66526601 - 2¹⁰ = 66525577 is a prime.

It is a super-2 number, since 2×66526601² = 8851577281226402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66526001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33263300 + 33263301.

It is an arithmetic number, because the mean of its divisors is an integer number (33263301).

Almost surely, 2^66526601 is an apocalyptic number.

It is an amenable number.

66526601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66526601 is an equidigital number, since it uses as much as digits as its factorization.

66526601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 66526601 is about 8156.3840640323. The cubic root of 66526601 is about 405.1959647083.

The spelling of 66526601 in words is "sixty-six million, five hundred twenty-six thousand, six hundred one".