640120212403 has 16 divisors (see below), whose sum is σ = 732364643520. Its totient is φ = 548075759616.

The previous prime is 640120212377. The next prime is 640120212437. The reversal of 640120212403 is 304212021046.

It is a happy number.

It is not a de Polignac number, because 640120212403 - 2²¹ = 640118115251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640120212203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30446751 + ... + 30467767.

It is an arithmetic number, because the mean of its divisors is an integer number (45772790220).

Almost surely, 2^640120212403 is an apocalyptic number.

640120212403 is a deficient number, since it is larger than the sum of its proper divisors (92244431117).

640120212403 is a wasteful number, since it uses less digits than its factorization.

640120212403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25566.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 640120212403 its reverse (304212021046), we get a palindrome (944332233449).

The spelling of 640120212403 in words is "six hundred forty billion, one hundred twenty million, two hundred twelve thousand, four hundred three".