81754997019 has 8 divisors (see below), whose sum is σ = 109014499920. Its totient is φ = 54499412736.

The previous prime is 81754997003. The next prime is 81754997029. The reversal of 81754997019 is 91079945718.

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

It is not a de Polignac number, because 81754997019 - 2⁴ = 81754997003 is a prime.

It is a super-2 number, since 2×81754997019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81754997029) 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, 930622 + ... + 1014675.

It is an arithmetic number, because the mean of its divisors is an integer number (13626812490).

Almost surely, 2^81754997019 is an apocalyptic number.

81754997019 is a deficient number, since it is larger than the sum of its proper divisors (27259502901).

81754997019 is a wasteful number, since it uses less digits than its factorization.

81754997019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959309.

The product of its (nonzero) digits is 5715360, while the sum is 60.

The spelling of 81754997019 in words is "eighty-one billion, seven hundred fifty-four million, nine hundred ninety-seven thousand, nineteen".