64400266040 has 32 divisors (see below), whose sum is σ = 158073381360. Its totient is φ = 23418278400.

The previous prime is 64400266037. The next prime is 64400266123. The reversal of 64400266040 is 4066200446.

It is a junction number, because it is equal to n+sod(n) for n = 64400265988 and 64400266006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73181681 + ... + 73182560.

Almost surely, 2^64400266040 is an apocalyptic number.

It is an amenable number.

64400266040 is an abundant number, since it is smaller than the sum of its proper divisors (93673115320).

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

64400266040 is a wasteful number, since it uses less digits than its factorization.

64400266040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146364263 (or 146364259 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 64400266040 its reverse (4066200446), we get a palindrome (68466466486).

The spelling of 64400266040 in words is "sixty-four billion, four hundred million, two hundred sixty-six thousand, forty".