81733365419 has 16 divisors (see below), whose sum is σ = 84878721600. Its totient is φ = 78610162176.

The previous prime is 81733365403. The next prime is 81733365421. The reversal of 81733365419 is 91456333718.

It is a cyclic number.

It is not a de Polignac number, because 81733365419 - 2⁴ = 81733365403 is a prime.

It is a super-2 number, since 2×81733365419² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81733365499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24624242 + ... + 24627560.

It is an arithmetic number, because the mean of its divisors is an integer number (5304920100).

Almost surely, 2^81733365419 is an apocalyptic number.

81733365419 is a deficient number, since it is larger than the sum of its proper divisors (3145356181).

81733365419 is a wasteful number, since it uses less digits than its factorization.

81733365419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6374.

The product of its digits is 1632960, while the sum is 50.

The spelling of 81733365419 in words is "eighty-one billion, seven hundred thirty-three million, three hundred sixty-five thousand, four hundred nineteen".