640115464361 has 4 divisors (see below), whose sum is σ = 640154118912. Its totient is φ = 640076809812.

The previous prime is 640115464337. The next prime is 640115464397. The reversal of 640115464361 is 163464511046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640115464361 - 2¹⁸ = 640115202217 is a prime.

It is a super-2 number, since 2×640115464361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640115464061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19302425 + ... + 19335558.

It is an arithmetic number, because the mean of its divisors is an integer number (160038529728).

Almost surely, 2^640115464361 is an apocalyptic number.

It is an amenable number.

640115464361 is a deficient number, since it is larger than the sum of its proper divisors (38654551).

640115464361 is a wasteful number, since it uses less digits than its factorization.

640115464361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38654550.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 640115464361 in words is "six hundred forty billion, one hundred fifteen million, four hundred sixty-four thousand, three hundred sixty-one".