72661800799 has 4 divisors (see below), whose sum is σ = 83042058064. Its totient is φ = 62281543536.

The previous prime is 72661800787. The next prime is 72661800817. The reversal of 72661800799 is 99700816627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99700816627 = 593 ⋅168129539.

It is a cyclic number.

It is not a de Polignac number, because 72661800799 - 2⁷ = 72661800671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72661800749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190128622 + ... + 5190128635.

It is an arithmetic number, because the mean of its divisors is an integer number (20760514516).

Almost surely, 2^72661800799 is an apocalyptic number.

72661800799 is a deficient number, since it is larger than the sum of its proper divisors (10380257265).

72661800799 is a wasteful number, since it uses less digits than its factorization.

72661800799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10380257264.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 72661800799 in words is "seventy-two billion, six hundred sixty-one million, eight hundred thousand, seven hundred ninety-nine".