662640537401 has 2 divisors, whose sum is σ = 662640537402. Its totient is φ = 662640537400.

The previous prime is 662640537379. The next prime is 662640537511. The reversal of 662640537401 is 104735046266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652015875625 + 10624661776 = 807475^2 + 103076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662640537401 is a prime.

It is not a weakly prime, because it can be changed into another prime (662640537101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331320268700 + 331320268701.

It is an arithmetic number, because the mean of its divisors is an integer number (331320268701).

Almost surely, 2^662640537401 is an apocalyptic number.

It is an amenable number.

662640537401 is a deficient number, since it is larger than the sum of its proper divisors (1).

662640537401 is an equidigital number, since it uses as much as digits as its factorization.

662640537401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 662640537401 in words is "six hundred sixty-two billion, six hundred forty million, five hundred thirty-seven thousand, four hundred one".