81680506151 has 8 divisors (see below), whose sum is σ = 83222538000. Its totient is φ = 80145023040.

The previous prime is 81680506099. The next prime is 81680506153. The reversal of 81680506151 is 15160508618.

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 81680506151 - 2⁶ = 81680506087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81680506099 and 81680506108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81680506153) 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, 1612001 + ... + 1661898.

It is an arithmetic number, because the mean of its divisors is an integer number (10402817250).

Almost surely, 2^81680506151 is an apocalyptic number.

81680506151 is a deficient number, since it is larger than the sum of its proper divisors (1542031849).

81680506151 is a wasteful number, since it uses less digits than its factorization.

81680506151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274369.

The product of its (nonzero) digits is 57600, while the sum is 41.

The spelling of 81680506151 in words is "eighty-one billion, six hundred eighty million, five hundred six thousand, one hundred fifty-one".