640405303036345 has 64 divisors (see below), whose sum is σ = 964488889036800. Its totient is φ = 396557189856000.

The previous prime is 640405303036253. The next prime is 640405303036351. The reversal of 640405303036345 is 543630303504046.

It is not a de Polignac number, because 640405303036345 - 2²¹ = 640405300939193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640405303036295 and 640405303036304.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2011486231 + ... + 2011804579.

It is an arithmetic number, because the mean of its divisors is an integer number (15070138891200).

Almost surely, 2^{640405303036345} is an apocalyptic number.

It is an amenable number.

640405303036345 is a deficient number, since it is larger than the sum of its proper divisors (324083586000455).

640405303036345 is a wasteful number, since it uses less digits than its factorization.

640405303036345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353126.

The product of its (nonzero) digits is 4665600, while the sum is 46.

The spelling of 640405303036345 in words is "six hundred forty trillion, four hundred five billion, three hundred three million, thirty-six thousand, three hundred forty-five".