72445551707245 has 4 divisors (see below), whose sum is σ = 86934662048700. Its totient is φ = 57956441365792.

The previous prime is 72445551707237. The next prime is 72445551707281. The reversal of 72445551707245 is 54270715554427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50497694705929 + 21947857001316 = 7106173^2 + 4684854^2 .

It is a cyclic number.

It is not a de Polignac number, because 72445551707245 - 2³ = 72445551707237 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 72445551707245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7244555170720 + ... + 7244555170729.

It is an arithmetic number, because the mean of its divisors is an integer number (21733665512175).

Almost surely, 2^{72445551707245} is an apocalyptic number.

It is an amenable number.

72445551707245 is a deficient number, since it is larger than the sum of its proper divisors (14489110341455).

72445551707245 is a wasteful number, since it uses less digits than its factorization.

72445551707245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14489110341454.

The product of its (nonzero) digits is 54880000, while the sum is 58.

The spelling of 72445551707245 in words is "seventy-two trillion, four hundred forty-five billion, five hundred fifty-one million, seven hundred seven thousand, two hundred forty-five".