647540637983 has 2 divisors, whose sum is σ = 647540637984. Its totient is φ = 647540637982.

The previous prime is 647540637979. The next prime is 647540638007. The reversal of 647540637983 is 389736045746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647540637983 - 2² = 647540637979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647540637973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323770318991 + 323770318992.

It is an arithmetic number, because the mean of its divisors is an integer number (323770318992).

Almost surely, 2^647540637983 is an apocalyptic number.

647540637983 is a deficient number, since it is larger than the sum of its proper divisors (1).

647540637983 is an equidigital number, since it uses as much as digits as its factorization.

647540637983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91445760, while the sum is 62.

The spelling of 647540637983 in words is "six hundred forty-seven billion, five hundred forty million, six hundred thirty-seven thousand, nine hundred eighty-three".