643036397337 has 6 divisors (see below), whose sum is σ = 928830351722. Its totient is φ = 428690931552.

The previous prime is 643036397291. The next prime is 643036397363. The reversal of 643036397337 is 733793630346.

It can be written as a sum of positive squares in only one way, i.e., 533595186576 + 109441210761 = 730476^2 + 330819^2 .

It is not a de Polignac number, because 643036397337 - 2¹⁵ = 643036364569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643036392337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35724244288 + ... + 35724244305.

Almost surely, 2^643036397337 is an apocalyptic number.

It is an amenable number.

643036397337 is a deficient number, since it is larger than the sum of its proper divisors (285793954385).

643036397337 is a wasteful number, since it uses less digits than its factorization.

643036397337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71448488599 (or 71448488596 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 54.

The spelling of 643036397337 in words is "six hundred forty-three billion, thirty-six million, three hundred ninety-seven thousand, three hundred thirty-seven".