81755967014623 has 8 divisors (see below), whose sum is σ = 89240515108560. Its totient is φ = 74280116830080.

The previous prime is 81755967014611. The next prime is 81755967014653. The reversal of 81755967014623 is 32641076955718.

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 81755967014623 - 2²⁹ = 81755430143711 is a prime.

It is a super-2 number, since 2×81755967014623² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81755967014653) 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, 2174457690 + ... + 2174495287.

It is an arithmetic number, because the mean of its divisors is an integer number (11155064388570).

It is a 1-persistent number, because it is pandigital, but 2⋅81755967014623 = 163511934029246 is not.

Almost surely, 2^{81755967014623} is an apocalyptic number.

81755967014623 is a deficient number, since it is larger than the sum of its proper divisors (7484548093937).

81755967014623 is a wasteful number, since it uses less digits than its factorization.

81755967014623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348954697.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 81755967014623 in words is "eighty-one trillion, seven hundred fifty-five billion, nine hundred sixty-seven million, fourteen thousand, six hundred twenty-three".