647940621383 has 16 divisors (see below), whose sum is σ = 748656444960. Its totient is φ = 554215065600.

The previous prime is 647940621371. The next prime is 647940621397. The reversal of 647940621383 is 383126049746.

It is a cyclic number.

It is not a de Polignac number, because 647940621383 - 2¹⁰ = 647940620359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647940621323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64463 + ... + 1140191.

It is an arithmetic number, because the mean of its divisors is an integer number (46791027810).

Almost surely, 2^647940621383 is an apocalyptic number.

647940621383 is a deficient number, since it is larger than the sum of its proper divisors (100715823577).

647940621383 is a wasteful number, since it uses less digits than its factorization.

647940621383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078978.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 647940621383 in words is "six hundred forty-seven billion, nine hundred forty million, six hundred twenty-one thousand, three hundred eighty-three".