640202689529 has 8 divisors (see below), whose sum is σ = 730004877000. Its totient is φ = 556194191616.

The previous prime is 640202689471. The next prime is 640202689547. The reversal of 640202689529 is 925986202046.

It can be written as a sum of positive squares in 4 ways, for example, as 202590010000 + 437612679529 = 450100^2 + 661523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640202689529 - 2²⁴ = 640185912313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640202689559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448422154 + ... + 1448422595.

It is an arithmetic number, because the mean of its divisors is an integer number (91250609625).

Almost surely, 2^640202689529 is an apocalyptic number.

It is an amenable number.

640202689529 is a deficient number, since it is larger than the sum of its proper divisors (89802187471).

640202689529 is a wasteful number, since it uses less digits than its factorization.

640202689529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896844779.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 640202689529 in words is "six hundred forty billion, two hundred two million, six hundred eighty-nine thousand, five hundred twenty-nine".