72143935665 has 32 divisors (see below), whose sum is σ = 120467333376. Its totient is φ = 36798263040.

The previous prime is 72143935607. The next prime is 72143935687. The reversal of 72143935665 is 56653934127.

It is a happy number.

It is not a de Polignac number, because 72143935665 - 2⁶ = 72143935601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3189295 + ... + 3211835.

It is an arithmetic number, because the mean of its divisors is an integer number (3764604168).

Almost surely, 2^72143935665 is an apocalyptic number.

It is an amenable number.

72143935665 is a deficient number, since it is larger than the sum of its proper divisors (48323397711).

72143935665 is a wasteful number, since it uses less digits than its factorization.

72143935665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31849.

The product of its digits is 4082400, while the sum is 51.

The spelling of 72143935665 in words is "seventy-two billion, one hundred forty-three million, nine hundred thirty-five thousand, six hundred sixty-five".