640135156641 has 24 divisors (see below), whose sum is σ = 878660528640. Its totient is φ = 414529207680.

The previous prime is 640135156631. The next prime is 640135156649. The reversal of 640135156641 is 146651531046.

It is not a de Polignac number, because 640135156641 - 2¹⁴ = 640135140257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640135156593 and 640135156602.

It is not an unprimeable number, because it can be changed into a prime (640135156649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 877696 + ... + 1431998.

It is an arithmetic number, because the mean of its divisors is an integer number (36610855360).

Almost surely, 2^640135156641 is an apocalyptic number.

It is an amenable number.

640135156641 is a deficient number, since it is larger than the sum of its proper divisors (238525371999).

640135156641 is a wasteful number, since it uses less digits than its factorization.

640135156641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554617 (or 554576 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

Adding to 640135156641 its reverse (146651531046), we get a palindrome (786786687687).

The spelling of 640135156641 in words is "six hundred forty billion, one hundred thirty-five million, one hundred fifty-six thousand, six hundred forty-one".