640745626547046 has 8 divisors (see below), whose sum is σ = 1281491253094104. Its totient is φ = 213581875515680.

The previous prime is 640745626546981. The next prime is 640745626547051.

640745626547046 is nontrivially palindromic in base 10.

640745626547046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

640745626547046 is an admirable number.

It is a super-2 number, since 2×640745626547046² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53395468878915 + ... + 53395468878926.

It is an arithmetic number, because the mean of its divisors is an integer number (160186406636763).

Almost surely, 2^{640745626547046} is an apocalyptic number.

640745626547046 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640745626547046 is a wasteful number, since it uses less digits than its factorization.

640745626547046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106790937757846.

The product of its (nonzero) digits is 812851200, while the sum is 66.

The spelling of 640745626547046 in words is "six hundred forty trillion, seven hundred forty-five billion, six hundred twenty-six million, five hundred forty-seven thousand, forty-six".