66235651 has 2 divisors, whose sum is σ = 66235652. Its totient is φ = 66235650.

The previous prime is 66235639. The next prime is 66235657. The reversal of 66235651 is 15653266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66235651 - 2⁵ = 66235619 is a prime.

It is a super-2 number, since 2×66235651² = 8774322926787602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66235657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33117825 + 33117826.

It is an arithmetic number, because the mean of its divisors is an integer number (33117826).

Almost surely, 2^66235651 is an apocalyptic number.

66235651 is a deficient number, since it is larger than the sum of its proper divisors (1).

66235651 is an equidigital number, since it uses as much as digits as its factorization.

66235651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 66235651 is about 8138.5287982534. The cubic root of 66235651 is about 404.6044015988.

The spelling of 66235651 in words is "sixty-six million, two hundred thirty-five thousand, six hundred fifty-one".