640946945741 has 8 divisors (see below), whose sum is σ = 649993459968. Its totient is φ = 631900962000.

The previous prime is 640946945711. The next prime is 640946945759. The reversal of 640946945741 is 147549649046.

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 640946945741 - 2³⁴ = 623767076557 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 (640946945701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2735351 + ... + 2960411.

It is an arithmetic number, because the mean of its divisors is an integer number (81249182496).

Almost surely, 2^640946945741 is an apocalyptic number.

It is an amenable number.

640946945741 is a deficient number, since it is larger than the sum of its proper divisors (9046514227).

640946945741 is a wasteful number, since it uses less digits than its factorization.

640946945741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265243.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 640946945741 in words is "six hundred forty billion, nine hundred forty-six million, nine hundred forty-five thousand, seven hundred forty-one".