64640063354 has 16 divisors (see below), whose sum is σ = 100100267520. Its totient is φ = 31273566480.

The previous prime is 64640063297. The next prime is 64640063357. The reversal of 64640063354 is 45336004646.

It is a super-3 number, since 3×64640063354³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (64640063357) 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, 474587 + ... + 595409.

It is an arithmetic number, because the mean of its divisors is an integer number (6256266720).

Almost surely, 2^64640063354 is an apocalyptic number.

64640063354 is a deficient number, since it is larger than the sum of its proper divisors (35460204166).

64640063354 is a wasteful number, since it uses less digits than its factorization.

64640063354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129485.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 64640063354 in words is "sixty-four billion, six hundred forty million, sixty-three thousand, three hundred fifty-four".