81382578614 has 4 divisors (see below), whose sum is σ = 122073867924. Its totient is φ = 40691289306.

The previous prime is 81382578611. The next prime is 81382578659. The reversal of 81382578614 is 41687528318.

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 (81382578611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345644652 + ... + 20345644655.

It is an arithmetic number, because the mean of its divisors is an integer number (30518466981).

Almost surely, 2^81382578614 is an apocalyptic number.

81382578614 is a deficient number, since it is larger than the sum of its proper divisors (40691289310).

81382578614 is a wasteful number, since it uses less digits than its factorization.

81382578614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40691289309.

The product of its digits is 2580480, while the sum is 53.

The spelling of 81382578614 in words is "eighty-one billion, three hundred eighty-two million, five hundred seventy-eight thousand, six hundred fourteen".