640408624045 has 16 divisors (see below), whose sum is σ = 827749707840. Its totient is φ = 474074826624.

The previous prime is 640408624043. The next prime is 640408624117. The reversal of 640408624045 is 540426804046.

640408624045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640408624045 - 2¹ = 640408624043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 640408623992 and 640408624010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640408624043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78381304 + ... + 78389473.

It is an arithmetic number, because the mean of its divisors is an integer number (51734356740).

Almost surely, 2^640408624045 is an apocalyptic number.

It is an amenable number.

640408624045 is a deficient number, since it is larger than the sum of its proper divisors (187341083795).

640408624045 is a wasteful number, since it uses less digits than its factorization.

640408624045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156770844.

The product of its (nonzero) digits is 737280, while the sum is 43.

The spelling of 640408624045 in words is "six hundred forty billion, four hundred eight million, six hundred twenty-four thousand, forty-five".