81850293161 has 8 divisors (see below), whose sum is σ = 100738822464. Its totient is φ = 64760671440.

The previous prime is 81850293149. The next prime is 81850293197. The reversal of 81850293161 is 16139205818.

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 81850293161 - 2¹⁰ = 81850292137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81850295161) 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, 449726795 + ... + 449726976.

It is an arithmetic number, because the mean of its divisors is an integer number (12592352808).

Almost surely, 2^81850293161 is an apocalyptic number.

It is an amenable number.

81850293161 is a deficient number, since it is larger than the sum of its proper divisors (18888529303).

81850293161 is a wasteful number, since it uses less digits than its factorization.

81850293161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899453791.

The product of its (nonzero) digits is 103680, while the sum is 44.

Adding to 81850293161 its reverse (16139205818), we get a palindrome (97989498979).

The spelling of 81850293161 in words is "eighty-one billion, eight hundred fifty million, two hundred ninety-three thousand, one hundred sixty-one".