646510348693 has 6 divisors (see below), whose sum is σ = 710627077622. Its totient is φ = 587736680520.

The previous prime is 646510348657. The next prime is 646510348697. The reversal of 646510348693 is 396843015646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 438188393764 + 208321954929 = 661958^2 + 456423^2 .

It is not a de Polignac number, because 646510348693 - 2²⁹ = 645973477781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646510348697) 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, 2671530246 + ... + 2671530487.

Almost surely, 2^646510348693 is an apocalyptic number.

It is an amenable number.

646510348693 is a deficient number, since it is larger than the sum of its proper divisors (64116728929).

646510348693 is a wasteful number, since it uses less digits than its factorization.

646510348693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343060755 (or 5343060744 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 55.

The spelling of 646510348693 in words is "six hundred forty-six billion, five hundred ten million, three hundred forty-eight thousand, six hundred ninety-three".