662628337681 has 2 divisors, whose sum is σ = 662628337682. Its totient is φ = 662628337680.

The previous prime is 662628337633. The next prime is 662628337697. The reversal of 662628337681 is 186733826266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656577987025 + 6050350656 = 810295^2 + 77784^2 .

It is a cyclic number.

It is not a de Polignac number, because 662628337681 - 2¹⁵ = 662628304913 is a prime.

It is a super-2 number, since 2×662628337681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (662628337621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331314168840 + 331314168841.

It is an arithmetic number, because the mean of its divisors is an integer number (331314168841).

Almost surely, 2^662628337681 is an apocalyptic number.

It is an amenable number.

662628337681 is a deficient number, since it is larger than the sum of its proper divisors (1).

662628337681 is an equidigital number, since it uses as much as digits as its factorization.

662628337681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 58.

The spelling of 662628337681 in words is "six hundred sixty-two billion, six hundred twenty-eight million, three hundred thirty-seven thousand, six hundred eighty-one".