640115420102 has 16 divisors (see below), whose sum is σ = 986272120512. Its totient is φ = 311400588480.

The previous prime is 640115420059. The next prime is 640115420107. The reversal of 640115420102 is 201024511046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640115420107) 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 7 ways as a sum of consecutive naturals, for example, 10605173 + ... + 10665360.

It is an arithmetic number, because the mean of its divisors is an integer number (61642007532).

Almost surely, 2^640115420102 is an apocalyptic number.

640115420102 is a deficient number, since it is larger than the sum of its proper divisors (346156700410).

640115420102 is a wasteful number, since it uses less digits than its factorization.

640115420102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21270943.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 640115420102 its reverse (201024511046), we get a palindrome (841139931148).

The spelling of 640115420102 in words is "six hundred forty billion, one hundred fifteen million, four hundred twenty thousand, one hundred two".