81039537337 has 8 divisors (see below), whose sum is σ = 88463494080. Its totient is φ = 73625034960.

The previous prime is 81039537301. The next prime is 81039537367. The reversal of 81039537337 is 73373593018.

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 81039537337 - 2¹⁹ = 81039013049 is a prime.

It is a super-2 number, since 2×81039537337² (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 (81039537367) 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, 2345658 + ... + 2379955.

It is an arithmetic number, because the mean of its divisors is an integer number (11057936760).

Almost surely, 2^81039537337 is an apocalyptic number.

It is an amenable number.

81039537337 is a deficient number, since it is larger than the sum of its proper divisors (7423956743).

81039537337 is a wasteful number, since it uses less digits than its factorization.

81039537337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727183.

The product of its (nonzero) digits is 1428840, while the sum is 49.

The spelling of 81039537337 in words is "eighty-one billion, thirty-nine million, five hundred thirty-seven thousand, three hundred thirty-seven".