81400220134 has 8 divisors (see below), whose sum is σ = 122112191448. Its totient is φ = 40696156320.

The previous prime is 81400220129. The next prime is 81400220137. The reversal of 81400220134 is 43102200418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81400220099 and 81400220108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81400220137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951072 + ... + 1992355.

It is an arithmetic number, because the mean of its divisors is an integer number (15264023931).

Almost surely, 2^81400220134 is an apocalyptic number.

81400220134 is a deficient number, since it is larger than the sum of its proper divisors (40711971314).

81400220134 is a wasteful number, since it uses less digits than its factorization.

81400220134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953750.

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 81400220134 in words is "eighty-one billion, four hundred million, two hundred twenty thousand, one hundred thirty-four".