81670068149 has 8 divisors (see below), whose sum is σ = 83506824960. Its totient is φ = 79853385456.

The previous prime is 81670068127. The next prime is 81670068157. The reversal of 81670068149 is 94186007618.

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 81670068149 - 2¹² = 81670064053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81670068097 and 81670068106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81670068119) 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, 5010302 + ... + 5026575.

It is an arithmetic number, because the mean of its divisors is an integer number (10438353120).

Almost surely, 2^81670068149 is an apocalyptic number.

It is an amenable number.

81670068149 is a deficient number, since it is larger than the sum of its proper divisors (1836756811).

81670068149 is a wasteful number, since it uses less digits than its factorization.

81670068149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10037059.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 81670068149 in words is "eighty-one billion, six hundred seventy million, sixty-eight thousand, one hundred forty-nine".