64460040660 has 36 divisors (see below), whose sum is σ = 195528790548. Its totient is φ = 17189344128.

The previous prime is 64460040647. The next prime is 64460040679. The reversal of 64460040660 is 6604006446.

It is a happy number.

64460040660 is a `hidden beast` number, since 6 + 4 + 4 + 600 + 40 + 6 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 38763309456 + 25696731204 = 196884^2 + 160302^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179055489 + ... + 179055848.

It is an arithmetic number, because the mean of its divisors is an integer number (5431355293).

Almost surely, 2^64460040660 is an apocalyptic number.

64460040660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64460040660 is an abundant number, since it is smaller than the sum of its proper divisors (131068749888).

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

64460040660 is a wasteful number, since it uses less digits than its factorization.

64460040660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358111352 (or 358111347 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 64460040660 in words is "sixty-four billion, four hundred sixty million, forty thousand, six hundred sixty".