640102351 has 8 divisors (see below), whose sum is σ = 763352064. Its totient is φ = 524804280.

The previous prime is 640102339. The next prime is 640102369. The reversal of 640102351 is 153201046.

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

It is a de Polignac number, because none of the positive numbers 2^k-640102351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640102051) 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, 1987735 + ... + 1988056.

It is an arithmetic number, because the mean of its divisors is an integer number (95419008).

Almost surely, 2^640102351 is an apocalyptic number.

640102351 is a deficient number, since it is larger than the sum of its proper divisors (123249713).

640102351 is a wasteful number, since it uses less digits than its factorization.

640102351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975821.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 640102351 is about 25300.2440897316. The cubic root of 640102351 is about 861.8198128442.

Adding to 640102351 its reverse (153201046), we get a palindrome (793303397).

The spelling of 640102351 in words is "six hundred forty million, one hundred two thousand, three hundred fifty-one".