640123133602 has 8 divisors (see below), whose sum is σ = 991158400512. Its totient is φ = 309737000100.

The previous prime is 640123133599. The next prime is 640123133603. The reversal of 640123133602 is 206331321046.

640123133602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (640123133603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5162283274 + ... + 5162283397.

It is an arithmetic number, because the mean of its divisors is an integer number (123894800064).

Almost surely, 2^640123133602 is an apocalyptic number.

640123133602 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

640123133602 is a deficient number, since it is larger than the sum of its proper divisors (351035266910).

640123133602 is a wasteful number, since it uses less digits than its factorization.

640123133602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324566704.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 640123133602 its reverse (206331321046), we get a palindrome (846454454648).

The spelling of 640123133602 in words is "six hundred forty billion, one hundred twenty-three million, one hundred thirty-three thousand, six hundred two".