72208423645 has 4 divisors (see below), whose sum is σ = 86650108380. Its totient is φ = 57766738912.

The previous prime is 72208423619. The next prime is 72208423649. The reversal of 72208423645 is 54632480227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54632480227 = 13 ⋅4202498479.

It can be written as a sum of positive squares in 2 ways, for example, as 9128082681 + 63080340964 = 95541^2 + 251158^2 .

It is a cyclic number.

It is not a de Polignac number, because 72208423645 - 2¹³ = 72208415453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72208423649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7220842360 + ... + 7220842369.

It is an arithmetic number, because the mean of its divisors is an integer number (21662527095).

Almost surely, 2^72208423645 is an apocalyptic number.

It is an amenable number.

72208423645 is a deficient number, since it is larger than the sum of its proper divisors (14441684735).

72208423645 is a wasteful number, since it uses less digits than its factorization.

72208423645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14441684734.

The product of its (nonzero) digits is 645120, while the sum is 43.

The spelling of 72208423645 in words is "seventy-two billion, two hundred eight million, four hundred twenty-three thousand, six hundred forty-five".