640347054061 has 16 divisors (see below), whose sum is σ = 754746366528. Its totient is φ = 535603795200.

The previous prime is 640347054043. The next prime is 640347054131. The reversal of 640347054061 is 160450743046.

It is a cyclic number.

It is not a de Polignac number, because 640347054061 - 2⁷ = 640347053933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640347051061) 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 15 ways as a sum of consecutive naturals, for example, 7249180 + ... + 7336981.

It is an arithmetic number, because the mean of its divisors is an integer number (47171647908).

Almost surely, 2^640347054061 is an apocalyptic number.

It is an amenable number.

640347054061 is a deficient number, since it is larger than the sum of its proper divisors (114399312467).

640347054061 is a wasteful number, since it uses less digits than its factorization.

640347054061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14586492.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 640347054061 in words is "six hundred forty billion, three hundred forty-seven million, fifty-four thousand, sixty-one".