72101685794 has 4 divisors (see below), whose sum is σ = 108152528694. Its totient is φ = 36050842896.

The previous prime is 72101685791. The next prime is 72101685797. The reversal of 72101685794 is 49758610127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72101685791) and next prime (72101685797).

It can be written as a sum of positive squares in only one way, i.e., 66119436769 + 5982249025 = 257137^2 + 77345^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72101685791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18025421447 + ... + 18025421450.

Almost surely, 2^72101685794 is an apocalyptic number.

72101685794 is a deficient number, since it is larger than the sum of its proper divisors (36050842900).

72101685794 is a wasteful number, since it uses less digits than its factorization.

72101685794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36050842899.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 72101685794 in words is "seventy-two billion, one hundred one million, six hundred eighty-five thousand, seven hundred ninety-four".