640834480361 has 4 divisors (see below), whose sum is σ = 641013338112. Its totient is φ = 640655622612.

The previous prime is 640834480337. The next prime is 640834480369. The reversal of 640834480361 is 163084438046.

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 640834480361 - 2³⁰ = 639760738537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640834480369) 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, 89423501 + ... + 89430666.

It is an arithmetic number, because the mean of its divisors is an integer number (160253334528).

Almost surely, 2^640834480361 is an apocalyptic number.

It is an amenable number.

640834480361 is a deficient number, since it is larger than the sum of its proper divisors (178857751).

640834480361 is a wasteful number, since it uses less digits than its factorization.

640834480361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178857750.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 640834480361 in words is "six hundred forty billion, eight hundred thirty-four million, four hundred eighty thousand, three hundred sixty-one".