640200744131 has 8 divisors (see below), whose sum is σ = 689491729920. Its totient is φ = 590916154752.

The previous prime is 640200744121. The next prime is 640200744193. The reversal of 640200744131 is 131447002046.

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

It is a cyclic number.

It is not a de Polignac number, because 640200744131 - 2³⁴ = 623020874947 is a prime.

It is a super-2 number, since 2×640200744131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640200744121) 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, 1390211 + ... + 1792508.

It is an arithmetic number, because the mean of its divisors is an integer number (86186466240).

Almost surely, 2^640200744131 is an apocalyptic number.

640200744131 is a deficient number, since it is larger than the sum of its proper divisors (49290985789).

640200744131 is a wasteful number, since it uses less digits than its factorization.

640200744131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198205.

The product of its (nonzero) digits is 16128, while the sum is 32.

Adding to 640200744131 its reverse (131447002046), we get a palindrome (771647746177).

The spelling of 640200744131 in words is "six hundred forty billion, two hundred million, seven hundred forty-four thousand, one hundred thirty-one".