64523693140 has 24 divisors (see below), whose sum is σ = 136311138432. Its totient is φ = 25654928160.

The previous prime is 64523693107. The next prime is 64523693191. The reversal of 64523693140 is 4139632546.

64523693140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 9655896 + ... + 9662575.

It is an arithmetic number, because the mean of its divisors is an integer number (5679630768).

Almost surely, 2^64523693140 is an apocalyptic number.

It is an amenable number.

64523693140 is an abundant number, since it is smaller than the sum of its proper divisors (71787445292).

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

64523693140 is a wasteful number, since it uses less digits than its factorization.

64523693140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19318647 (or 19318645 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 64523693140 in words is "sixty-four billion, five hundred twenty-three million, six hundred ninety-three thousand, one hundred forty".