640161557060341 has 4 divisors (see below), whose sum is σ = 640208070302112. Its totient is φ = 640115043818572.

The previous prime is 640161557060303. The next prime is 640161557060371. The reversal of 640161557060341 is 143060755161046.

640161557060341 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-640161557060341 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 (640161557060371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23256600241 + ... + 23256627766.

It is an arithmetic number, because the mean of its divisors is an integer number (160052017575528).

Almost surely, 2^{640161557060341} is an apocalyptic number.

It is an amenable number.

640161557060341 is a deficient number, since it is larger than the sum of its proper divisors (46513241771).

640161557060341 is a wasteful number, since it uses less digits than its factorization.

640161557060341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46513241770.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 640161557060341 in words is "six hundred forty trillion, one hundred sixty-one billion, five hundred fifty-seven million, sixty thousand, three hundred forty-one".