81072268545 has 16 divisors (see below), whose sum is σ = 129739419072. Its totient is φ = 43230613440.

The previous prime is 81072268517. The next prime is 81072268547. The reversal of 81072268545 is 54586227018.

It is not a de Polignac number, because 81072268545 - 2⁹ = 81072268033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81072268494 and 81072268503.

It is not an unprimeable number, because it can be changed into a prime (81072268547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410626 + ... + 575115.

It is an arithmetic number, because the mean of its divisors is an integer number (8108713692).

Almost surely, 2^81072268545 is an apocalyptic number.

It is an amenable number.

81072268545 is a deficient number, since it is larger than the sum of its proper divisors (48667150527).

81072268545 is a wasteful number, since it uses less digits than its factorization.

81072268545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991232.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 81072268545 in words is "eighty-one billion, seventy-two million, two hundred sixty-eight thousand, five hundred forty-five".