81351643035 has 64 divisors (see below), whose sum is σ = 144156644352. Its totient is φ = 38915375616.

The previous prime is 81351642997. The next prime is 81351643063. The reversal of 81351643035 is 53034615318.

It is not a de Polignac number, because 81351643035 - 2¹⁶ = 81351577499 is a prime.

It is a super-2 number, since 2×81351643035² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 81351642984 and 81351643002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5671042 + ... + 5685368.

It is an arithmetic number, because the mean of its divisors is an integer number (2252447568).

Almost surely, 2^81351643035 is an apocalyptic number.

81351643035 is a deficient number, since it is larger than the sum of its proper divisors (62805001317).

81351643035 is a wasteful number, since it uses less digits than its factorization.

81351643035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15172.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 81351643035 in words is "eighty-one billion, three hundred fifty-one million, six hundred forty-three thousand, thirty-five".