81755201373 has 16 divisors (see below), whose sum is σ = 109177222656. Its totient is φ = 54418382640.

The previous prime is 81755201323. The next prime is 81755201431. The reversal of 81755201373 is 37310255718.

It is a happy number.

It is not a de Polignac number, because 81755201373 - 2¹⁶ = 81755135837 is a prime.

It is a super-3 number, since 3×81755201373³ (a number of 34 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81755201323) 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, 7371090 + ... + 7382172.

It is an arithmetic number, because the mean of its divisors is an integer number (6823576416).

Almost surely, 2^81755201373 is an apocalyptic number.

It is an amenable number.

81755201373 is a deficient number, since it is larger than the sum of its proper divisors (27422021283).

81755201373 is a wasteful number, since it uses less digits than its factorization.

81755201373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14704.

The product of its (nonzero) digits is 176400, while the sum is 42.

It can be divided in two parts, 81755 and 201373, that added together give a triangular number (283128 = T₇₅₂).

The spelling of 81755201373 in words is "eighty-one billion, seven hundred fifty-five million, two hundred one thousand, three hundred seventy-three".