72345487661 has 16 divisors (see below), whose sum is σ = 74634740928. Its totient is φ = 70099785600.

The previous prime is 72345487637. The next prime is 72345487667. The reversal of 72345487661 is 16678454327.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72345487661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72345487667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061726 + ... + 1127808.

It is an arithmetic number, because the mean of its divisors is an integer number (4664671308).

Almost surely, 2^72345487661 is an apocalyptic number.

It is an amenable number.

72345487661 is a deficient number, since it is larger than the sum of its proper divisors (2289253267).

72345487661 is a wasteful number, since it uses less digits than its factorization.

72345487661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66412.

The product of its digits is 6773760, while the sum is 53.

The spelling of 72345487661 in words is "seventy-two billion, three hundred forty-five million, four hundred eighty-seven thousand, six hundred sixty-one".