72646171445069 has 4 divisors (see below), whose sum is σ = 72715424231100. Its totient is φ = 72576918659040.

The previous prime is 72646171445011. The next prime is 72646171445087. The reversal of 72646171445069 is 96054417164627.

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 40830502515625 + 31815668929444 = 6389875^2 + 5640538^2 .

It is a cyclic number.

It is not a de Polignac number, because 72646171445069 - 2²⁸ = 72645903009613 is a prime.

It is a super-2 number, since 2×72646171445069² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72646171445269) by changing a digit.

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, 34626391442 + ... + 34626393539.

It is an arithmetic number, because the mean of its divisors is an integer number (18178856057775).

Almost surely, 2^{72646171445069} is an apocalyptic number.

It is an amenable number.

72646171445069 is a deficient number, since it is larger than the sum of its proper divisors (69252786031).

72646171445069 is a wasteful number, since it uses less digits than its factorization.

72646171445069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69252786030.

The product of its (nonzero) digits is 60963840, while the sum is 62.

The spelling of 72646171445069 in words is "seventy-two trillion, six hundred forty-six billion, one hundred seventy-one million, four hundred forty-five thousand, sixty-nine".