81498349569 has 32 divisors (see below), whose sum is σ = 139555713024. Its totient is φ = 41119087680.

The previous prime is 81498349567. The next prime is 81498349591. The reversal of 81498349569 is 96594389418.

It is not a de Polignac number, because 81498349569 - 2¹ = 81498349567 is a prime.

It is a super-2 number, since 2×81498349569² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81498349567) 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, 6483477 + ... + 6496034.

It is an arithmetic number, because the mean of its divisors is an integer number (4361116032).

Almost surely, 2^81498349569 is an apocalyptic number.

It is an amenable number.

81498349569 is a deficient number, since it is larger than the sum of its proper divisors (58057363455).

81498349569 is a wasteful number, since it uses less digits than its factorization.

81498349569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12979557.

The product of its digits is 67184640, while the sum is 66.

The spelling of 81498349569 in words is "eighty-one billion, four hundred ninety-eight million, three hundred forty-nine thousand, five hundred sixty-nine".