81351643034 has 32 divisors (see below), whose sum is σ = 130512646656. Its totient is φ = 37941742080.

The previous prime is 81351642997. The next prime is 81351643063. The reversal of 81351643034 is 43034615318.

It is a super-3 number, since 3×81351643034³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530954 + ... + 666794.

It is an arithmetic number, because the mean of its divisors is an integer number (4078520208).

Almost surely, 2^81351643034 is an apocalyptic number.

81351643034 is a deficient number, since it is larger than the sum of its proper divisors (49161003622).

81351643034 is a wasteful number, since it uses less digits than its factorization.

81351643034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136190.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 81351643034 in words is "eighty-one billion, three hundred fifty-one million, six hundred forty-three thousand, thirty-four".