64622066440 has 32 divisors (see below), whose sum is σ = 146839259160. Its totient is φ = 25592896000.

The previous prime is 64622066417. The next prime is 64622066441. The reversal of 64622066440 is 4466022646.

64622066440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 63168779556 + 1453286884 = 251334^2 + 38122^2 .

It is a super-2 number, since 2×64622066440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64622066393 and 64622066402.

It is not an unprimeable number, because it can be changed into a prime (64622066441) 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, 7993741 + ... + 8001820.

Almost surely, 2^64622066440 is an apocalyptic number.

It is an amenable number.

64622066440 is an abundant number, since it is smaller than the sum of its proper divisors (82217192720).

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

64622066440 is a wasteful number, since it uses less digits than its factorization.

64622066440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15995673 (or 15995669 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

It can be divided in two parts, 6462206 and 6440, that added together give a palindrome (6468646).

The spelling of 64622066440 in words is "sixty-four billion, six hundred twenty-two million, sixty-six thousand, four hundred forty".