81353045715 has 16 divisors (see below), whose sum is σ = 130447237536. Its totient is φ = 43294169600.

The previous prime is 81353045713. The next prime is 81353045723. The reversal of 81353045715 is 51754035318.

It is not a de Polignac number, because 81353045715 - 2¹ = 81353045713 is a prime.

It is a super-2 number, since 2×81353045715² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81353045713) 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, 5875446 + ... + 5889275.

It is an arithmetic number, because the mean of its divisors is an integer number (8152952346).

Almost surely, 2^81353045715 is an apocalyptic number.

81353045715 is a deficient number, since it is larger than the sum of its proper divisors (49094191821).

81353045715 is a wasteful number, since it uses less digits than its factorization.

81353045715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11765190.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 81353045715 in words is "eighty-one billion, three hundred fifty-three million, forty-five thousand, seven hundred fifteen".