81335151513 has 80 divisors (see below), whose sum is σ = 156705183360. Its totient is φ = 40794969600.

The previous prime is 81335151511. The next prime is 81335151517. The reversal of 81335151513 is 31515153318.

81335151513 is a `hidden beast` number, since 8 + 133 + 5 + 1 + 5 + 1 + 513 = 666.

It is not a de Polignac number, because 81335151513 - 2¹ = 81335151511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81335151511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 43968 + ... + 405713.

It is an arithmetic number, because the mean of its divisors is an integer number (1958814792).

Almost surely, 2^81335151513 is an apocalyptic number.

It is an amenable number.

81335151513 is a deficient number, since it is larger than the sum of its proper divisors (75370031847).

81335151513 is a wasteful number, since it uses less digits than its factorization.

81335151513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449740 (or 449731 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 81335151513 in words is "eighty-one billion, three hundred thirty-five million, one hundred fifty-one thousand, five hundred thirteen".