660266801 has 2 divisors, whose sum is σ = 660266802. Its totient is φ = 660266800.

The previous prime is 660266767. The next prime is 660266807. The reversal of 660266801 is 108662066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638876176 + 21390625 = 25276^2 + 4625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660266801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660266807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330133400 + 330133401.

It is an arithmetic number, because the mean of its divisors is an integer number (330133401).

Almost surely, 2^660266801 is an apocalyptic number.

It is an amenable number.

660266801 is a deficient number, since it is larger than the sum of its proper divisors (1).

660266801 is an equidigital number, since it uses as much as digits as its factorization.

660266801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 660266801 is about 25695.6572400863. The cubic root of 660266801 is about 870.7760728226.

It can be divided in two parts, 66026 and 6801, that added together give a palindrome (72827).

The spelling of 660266801 in words is "six hundred sixty million, two hundred sixty-six thousand, eight hundred one".