81929753049 has 8 divisors (see below), whose sum is σ = 109422043200. Its totient is φ = 54528649136.

The previous prime is 81929753011. The next prime is 81929753051. The reversal of 81929753049 is 94035792918.

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 81929753049 - 2⁹ = 81929752537 is a prime.

It is a super-3 number, since 3×81929753049³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81929753049.

It is not an unprimeable number, because it can be changed into a prime (81929753069) 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, 22794462 + ... + 22798055.

It is an arithmetic number, because the mean of its divisors is an integer number (13677755400).

Almost surely, 2^81929753049 is an apocalyptic number.

It is an amenable number.

81929753049 is a deficient number, since it is larger than the sum of its proper divisors (27492290151).

81929753049 is a wasteful number, since it uses less digits than its factorization.

81929753049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45593119.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 81929753049 in words is "eighty-one billion, nine hundred twenty-nine million, seven hundred fifty-three thousand, forty-nine".