81467785707 has 16 divisors (see below), whose sum is σ = 135426968832. Its totient is φ = 42320927520.

The previous prime is 81467785703. The next prime is 81467785769. The reversal of 81467785707 is 70758776418.

It is not a de Polignac number, because 81467785707 - 2² = 81467785703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81467785703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176336968 + ... + 176337429.

It is an arithmetic number, because the mean of its divisors is an integer number (8464185552).

Almost surely, 2^81467785707 is an apocalyptic number.

81467785707 is a deficient number, since it is larger than the sum of its proper divisors (53959183125).

81467785707 is a wasteful number, since it uses less digits than its factorization.

81467785707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352674418.

The product of its (nonzero) digits is 18439680, while the sum is 60.

The spelling of 81467785707 in words is "eighty-one billion, four hundred sixty-seven million, seven hundred eighty-five thousand, seven hundred seven".