640437622143 has 16 divisors (see below), whose sum is σ = 931680755712. Its totient is φ = 388087712000.

The previous prime is 640437622133. The next prime is 640437622147. The reversal of 640437622143 is 341226734046.

It is a cyclic number.

It is not a de Polignac number, because 640437622143 - 2¹⁰ = 640437621119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640437622095 and 640437622104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640437622147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176018 + ... + 1632143.

It is an arithmetic number, because the mean of its divisors is an integer number (58230047232).

Almost surely, 2^640437622143 is an apocalyptic number.

640437622143 is a deficient number, since it is larger than the sum of its proper divisors (291243133569).

640437622143 is a wasteful number, since it uses less digits than its factorization.

640437622143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815086.

The product of its (nonzero) digits is 580608, while the sum is 42.

The spelling of 640437622143 in words is "six hundred forty billion, four hundred thirty-seven million, six hundred twenty-two thousand, one hundred forty-three".