81191735414 has 4 divisors (see below), whose sum is σ = 121787603124. Its totient is φ = 40595867706.

The previous prime is 81191735413. The next prime is 81191735437. The reversal of 81191735414 is 41453719118.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81191735413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20297933852 + ... + 20297933855.

It is an arithmetic number, because the mean of its divisors is an integer number (30446900781).

Almost surely, 2^81191735414 is an apocalyptic number.

81191735414 is a deficient number, since it is larger than the sum of its proper divisors (40595867710).

81191735414 is a wasteful number, since it uses less digits than its factorization.

81191735414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40595867709.

The product of its digits is 120960, while the sum is 44.

The spelling of 81191735414 in words is "eighty-one billion, one hundred ninety-one million, seven hundred thirty-five thousand, four hundred fourteen".