81470783806 has 8 divisors (see below), whose sum is σ = 122214193920. Its totient is φ = 40732719168.

The previous prime is 81470783777. The next prime is 81470783809. The reversal of 81470783806 is 60838707418.

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

It is a super-2 number, since 2×81470783806² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470783809) 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, 1298046 + ... + 1359361.

It is an arithmetic number, because the mean of its divisors is an integer number (15276774240).

Almost surely, 2^81470783806 is an apocalyptic number.

81470783806 is a deficient number, since it is larger than the sum of its proper divisors (40743410114).

81470783806 is a wasteful number, since it uses less digits than its factorization.

81470783806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672738.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 81470783806 in words is "eighty-one billion, four hundred seventy million, seven hundred eighty-three thousand, eight hundred six".