640705507046 has 64 divisors (see below), whose sum is σ = 1126837578240. Its totient is φ = 269973312000.

The previous prime is 640705507033. The next prime is 640705507049.

640705507046 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×640705507046² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640705506988 and 640705507006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640705507049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28374941 + ... + 28397511.

It is an arithmetic number, because the mean of its divisors is an integer number (17606837160).

Almost surely, 2^640705507046 is an apocalyptic number.

640705507046 is a deficient number, since it is larger than the sum of its proper divisors (486132071194).

640705507046 is a wasteful number, since it uses less digits than its factorization.

640705507046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23741.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 640705507046 in words is "six hundred forty billion, seven hundred five million, five hundred seven thousand, forty-six".