640120140541 has 8 divisors (see below), whose sum is σ = 731570906304. Its totient is φ = 548670632640.

The previous prime is 640120140463. The next prime is 640120140581. The reversal of 640120140541 is 145041021046.

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 640120140541 - 2²⁹ = 639583269629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640120140581) 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, 1397061 + ... + 1797781.

It is an arithmetic number, because the mean of its divisors is an integer number (91446363288).

Almost surely, 2^640120140541 is an apocalyptic number.

It is an amenable number.

640120140541 is a deficient number, since it is larger than the sum of its proper divisors (91450765763).

640120140541 is a wasteful number, since it uses less digits than its factorization.

640120140541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628931.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 640120140541 its reverse (145041021046), we get a palindrome (785161161587).

The spelling of 640120140541 in words is "six hundred forty billion, one hundred twenty million, one hundred forty thousand, five hundred forty-one".