640462164405 has 32 divisors (see below), whose sum is σ = 1240020866304. Its totient is φ = 275560190976.

The previous prime is 640462164401. The next prime is 640462164421. The reversal of 640462164405 is 504461264046.

It is not a de Polignac number, because 640462164405 - 2² = 640462164401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640462164401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179399382 + ... + 179402951.

It is an arithmetic number, because the mean of its divisors is an integer number (38750652072).

Almost surely, 2^640462164405 is an apocalyptic number.

It is an amenable number.

640462164405 is a deficient number, since it is larger than the sum of its proper divisors (599558701899).

640462164405 is a wasteful number, since it uses less digits than its factorization.

640462164405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358802365.

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 640462164405 in words is "six hundred forty billion, four hundred sixty-two million, one hundred sixty-four thousand, four hundred five".