72521719034 has 4 divisors (see below), whose sum is σ = 108782578554. Its totient is φ = 36260859516.

The previous prime is 72521719031. The next prime is 72521719043. The reversal of 72521719034 is 43091712527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43091712527 = 1499 ⋅28746973.

It can be written as a sum of positive squares in only one way, i.e., 53738194225 + 18783524809 = 231815^2 + 137053^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72521718982 and 72521719000.

It is not an unprimeable number, because it can be changed into a prime (72521719031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18130429757 + ... + 18130429760.

Almost surely, 2^72521719034 is an apocalyptic number.

72521719034 is a deficient number, since it is larger than the sum of its proper divisors (36260859520).

72521719034 is a wasteful number, since it uses less digits than its factorization.

72521719034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36260859519.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 72521719034 in words is "seventy-two billion, five hundred twenty-one million, seven hundred nineteen thousand, thirty-four".