640230355065052 has 24 divisors (see below), whose sum is σ = 1179434047299200. Its totient is φ = 303250979853936.

The previous prime is 640230355065031. The next prime is 640230355065053. The reversal of 640230355065052 is 250560553032046.

640230355065052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×640230355065052² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640230355064993 and 640230355065011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640230355065053) 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, 221197698 + ... + 224073385.

Almost surely, 2^{640230355065052} is an apocalyptic number.

It is an amenable number.

640230355065052 is a deficient number, since it is larger than the sum of its proper divisors (539203692234148).

640230355065052 is a wasteful number, since it uses less digits than its factorization.

640230355065052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445290025 (or 445290023 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 46.

The spelling of 640230355065052 in words is "six hundred forty trillion, two hundred thirty billion, three hundred fifty-five million, sixty-five thousand, fifty-two".