640461235033 has 8 divisors (see below), whose sum is σ = 663918394752. Its totient is φ = 617327622576.

The previous prime is 640461234997. The next prime is 640461235123. The reversal of 640461235033 is 330532164046.

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 640461235033 - 2⁹ = 640461234521 is a prime.

It is a super-2 number, since 2×640461235033² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640461234983 and 640461235001.

It is not an unprimeable number, because it can be changed into a prime (640461235333) 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, 80882785 + ... + 80890702.

It is an arithmetic number, because the mean of its divisors is an integer number (82989799344).

Almost surely, 2^640461235033 is an apocalyptic number.

It is an amenable number.

640461235033 is a deficient number, since it is larger than the sum of its proper divisors (23457159719).

640461235033 is a wasteful number, since it uses less digits than its factorization.

640461235033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161773631.

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 640461235033 its reverse (330532164046), we get a palindrome (970993399079).

The spelling of 640461235033 in words is "six hundred forty billion, four hundred sixty-one million, two hundred thirty-five thousand, thirty-three".