81151367671 has 32 divisors (see below), whose sum is σ = 94571366400. Its totient is φ = 68817530880.

The previous prime is 81151367651. The next prime is 81151367699. The reversal of 81151367671 is 17676315118.

It is a cyclic number.

It is not a de Polignac number, because 81151367671 - 2¹³ = 81151359479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151367651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17490970 + ... + 17495608.

It is an arithmetic number, because the mean of its divisors is an integer number (2955355200).

Almost surely, 2^81151367671 is an apocalyptic number.

81151367671 is a deficient number, since it is larger than the sum of its proper divisors (13419998729).

81151367671 is a wasteful number, since it uses less digits than its factorization.

81151367671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5479.

The product of its digits is 211680, while the sum is 46.

The spelling of 81151367671 in words is "eighty-one billion, one hundred fifty-one million, three hundred sixty-seven thousand, six hundred seventy-one".