640152246727731 has 8 divisors (see below), whose sum is σ = 856936872114624. Its totient is φ = 425067892913000.

The previous prime is 640152246727709. The next prime is 640152246727733. The reversal of 640152246727731 is 137727642251046.

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 640152246727731 - 2⁵ = 640152246727699 is a prime.

It is a super-2 number, since 2×640152246727731² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640152246727733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425067892161 + ... + 425067893666.

It is an arithmetic number, because the mean of its divisors is an integer number (107117109014328).

Almost surely, 2^{640152246727731} is an apocalyptic number.

640152246727731 is a deficient number, since it is larger than the sum of its proper divisors (216784625386893).

640152246727731 is a wasteful number, since it uses less digits than its factorization.

640152246727731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850135786081.

The product of its (nonzero) digits is 23708160, while the sum is 57.

Adding to 640152246727731 its reverse (137727642251046), we get a palindrome (777879888978777).

The spelling of 640152246727731 in words is "six hundred forty trillion, one hundred fifty-two billion, two hundred forty-six million, seven hundred twenty-seven thousand, seven hundred thirty-one".