72545161785 has 32 divisors (see below), whose sum is σ = 117136710912. Its totient is φ = 38337235200.

The previous prime is 72545161783. The next prime is 72545161789. The reversal of 72545161785 is 58716154527.

It is not a de Polignac number, because 72545161785 - 2¹ = 72545161783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72545161783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 858867 + ... + 939543.

It is an arithmetic number, because the mean of its divisors is an integer number (3660522216).

Almost surely, 2^72545161785 is an apocalyptic number.

It is an amenable number.

72545161785 is a deficient number, since it is larger than the sum of its proper divisors (44591549127).

72545161785 is a wasteful number, since it uses less digits than its factorization.

72545161785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81233.

The product of its digits is 2352000, while the sum is 51.

The spelling of 72545161785 in words is "seventy-two billion, five hundred forty-five million, one hundred sixty-one thousand, seven hundred eighty-five".