640100623541 has 8 divisors (see below), whose sum is σ = 674807522304. Its totient is φ = 606272380560.

The previous prime is 640100623531. The next prime is 640100623573. The reversal of 640100623541 is 145326001046.

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 640100623541 - 2³⁸ = 365222716597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640100623498 and 640100623507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640100623531) 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, 219662450 + ... + 219665363.

It is an arithmetic number, because the mean of its divisors is an integer number (84350940288).

Almost surely, 2^640100623541 is an apocalyptic number.

It is an amenable number.

640100623541 is a deficient number, since it is larger than the sum of its proper divisors (34706898763).

640100623541 is a wasteful number, since it uses less digits than its factorization.

640100623541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439327891.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 640100623541 its reverse (145326001046), we get a palindrome (785426624587).

The spelling of 640100623541 in words is "six hundred forty billion, one hundred million, six hundred twenty-three thousand, five hundred forty-one".