640703999999 has 8 divisors (see below), whose sum is σ = 737822709888. Its totient is φ = 544982681880.

The previous prime is 640703999987. The next prime is 640704000017. The reversal of 640703999999 is 999999307046.

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

It is not a de Polignac number, because 640703999999 - 2³⁶ = 571984523263 is a prime.

It is a super-2 number, since 2×640703999999² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

640703999999 is a modest number, since divided by 999999 gives 640703 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640703999399) 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, 349346957 + ... + 349348790.

It is an arithmetic number, because the mean of its divisors is an integer number (92227838736).

Almost surely, 2^640703999999 is an apocalyptic number.

640703999999 is a deficient number, since it is larger than the sum of its proper divisors (97118709889).

640703999999 is a wasteful number, since it uses less digits than its factorization.

640703999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698695885.

The product of its (nonzero) digits is 267846264, while the sum is 74.

The spelling of 640703999999 in words is "six hundred forty billion, seven hundred three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".