662621671 has 2 divisors, whose sum is σ = 662621672. Its totient is φ = 662621670.

The previous prime is 662621579. The next prime is 662621719. The reversal of 662621671 is 176126266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 662621671 - 2¹⁵ = 662588903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 662621671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662621171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331310835 + 331310836.

It is an arithmetic number, because the mean of its divisors is an integer number (331310836).

Almost surely, 2^662621671 is an apocalyptic number.

662621671 is a deficient number, since it is larger than the sum of its proper divisors (1).

662621671 is an equidigital number, since it uses as much as digits as its factorization.

662621671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 662621671 is about 25741.4387904018. The cubic root of 662621671 is about 871.8100646662.

The spelling of 662621671 in words is "six hundred sixty-two million, six hundred twenty-one thousand, six hundred seventy-one".