81744333397 has 8 divisors (see below), whose sum is σ = 82904054144. Its totient is φ = 80585692128.

The previous prime is 81744333367. The next prime is 81744333427. The reversal of 81744333397 is 79333344718.

It is an interprime number because it is at equal distance from previous prime (81744333367) and next prime (81744333427).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81744333397 - 2⁷ = 81744333269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81744333317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116733 + ... + 420850.

It is an arithmetic number, because the mean of its divisors is an integer number (10363006768).

Almost surely, 2^81744333397 is an apocalyptic number.

It is an amenable number.

81744333397 is a deficient number, since it is larger than the sum of its proper divisors (1159720747).

81744333397 is a wasteful number, since it uses less digits than its factorization.

81744333397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539739.

The product of its digits is 4572288, while the sum is 52.

The spelling of 81744333397 in words is "eighty-one billion, seven hundred forty-four million, three hundred thirty-three thousand, three hundred ninety-seven".