72945745445 has 4 divisors (see below), whose sum is σ = 87534894540. Its totient is φ = 58356596352.

The previous prime is 72945745429. The next prime is 72945745447. The reversal of 72945745445 is 54454754927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54454754927 = 19 ⋅2866039733.

It can be written as a sum of positive squares in 2 ways, for example, as 24911571556 + 48034173889 = 157834^2 + 219167^2 .

It is a cyclic number.

It is not a de Polignac number, because 72945745445 - 2⁴ = 72945745429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72945745447) 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, 7294574540 + ... + 7294574549.

It is an arithmetic number, because the mean of its divisors is an integer number (21883723635).

Almost surely, 2^72945745445 is an apocalyptic number.

It is an amenable number.

72945745445 is a deficient number, since it is larger than the sum of its proper divisors (14589149095).

72945745445 is a wasteful number, since it uses less digits than its factorization.

72945745445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14589149094.

The product of its digits is 28224000, while the sum is 56.

The spelling of 72945745445 in words is "seventy-two billion, nine hundred forty-five million, seven hundred forty-five thousand, four hundred forty-five".