81355025269 has 16 divisors (see below), whose sum is σ = 95884185600. Its totient is φ = 67575450240.

The previous prime is 81355025267. The next prime is 81355025369. The reversal of 81355025269 is 96252055318.

It is a cyclic number.

It is not a de Polignac number, because 81355025269 - 2¹ = 81355025267 is a prime.

It is a super-2 number, since 2×81355025269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81355025267) 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 15 ways as a sum of consecutive naturals, for example, 908469 + ... + 993994.

It is an arithmetic number, because the mean of its divisors is an integer number (5992761600).

Almost surely, 2^81355025269 is an apocalyptic number.

It is an amenable number.

81355025269 is a deficient number, since it is larger than the sum of its proper divisors (14529160331).

81355025269 is a wasteful number, since it uses less digits than its factorization.

81355025269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902660.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 81355025269 in words is "eighty-one billion, three hundred fifty-five million, twenty-five thousand, two hundred sixty-nine".