640312633502 has 16 divisors (see below), whose sum is σ = 991954518912. Its totient is φ = 309671600160.

The previous prime is 640312633501. The next prime is 640312633517. The reversal of 640312633502 is 205336213046.

640312633502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640312633501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2494913 + ... + 2739564.

It is an arithmetic number, because the mean of its divisors is an integer number (61997157432).

Almost surely, 2^640312633502 is an apocalyptic number.

640312633502 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

640312633502 is a deficient number, since it is larger than the sum of its proper divisors (351641885410).

640312633502 is a wasteful number, since it uses less digits than its factorization.

640312633502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5236483.

The product of its (nonzero) digits is 77760, while the sum is 35.

Adding to 640312633502 its reverse (205336213046), we get a palindrome (845648846548).

The spelling of 640312633502 in words is "six hundred forty billion, three hundred twelve million, six hundred thirty-three thousand, five hundred two".