662620997 has 2 divisors, whose sum is σ = 662620998. Its totient is φ = 662620996.

The previous prime is 662620969. The next prime is 662621009. The reversal of 662620997 is 799026266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487482241 + 175138756 = 22079^2 + 13234^2 .

It is a cyclic number.

It is not a de Polignac number, because 662620997 - 2²⁰ = 661572421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662620957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331310498 + 331310499.

It is an arithmetic number, because the mean of its divisors is an integer number (331310499).

Almost surely, 2^662620997 is an apocalyptic number.

It is an amenable number.

662620997 is a deficient number, since it is larger than the sum of its proper divisors (1).

662620997 is an equidigital number, since it uses as much as digits as its factorization.

662620997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 662620997 is about 25741.4256986671. The cubic root of 662620997 is about 871.8097690726.

The spelling of 662620997 in words is "six hundred sixty-two million, six hundred twenty thousand, nine hundred ninety-seven".