640815319741 has 8 divisors (see below), whose sum is σ = 641449618560. Its totient is φ = 640181265648.

The previous prime is 640815319643. The next prime is 640815319757. The reversal of 640815319741 is 147913518046.

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 640815319741 - 2¹¹ = 640815317693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640815316741) 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, 5419075 + ... + 5536063.

It is an arithmetic number, because the mean of its divisors is an integer number (80181202320).

Almost surely, 2^640815319741 is an apocalyptic number.

It is an amenable number.

640815319741 is a deficient number, since it is larger than the sum of its proper divisors (634298819).

640815319741 is a wasteful number, since it uses less digits than its factorization.

640815319741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122363.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 640815319741 in words is "six hundred forty billion, eight hundred fifteen million, three hundred nineteen thousand, seven hundred forty-one".