81608417670 has 64 divisors (see below), whose sum is σ = 216627122880. Its totient is φ = 19545297408.

The previous prime is 81608417641. The next prime is 81608417677. The reversal of 81608417670 is 7671480618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81608417677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2813305 + ... + 2842164.

It is an arithmetic number, because the mean of its divisors is an integer number (3384798795).

Almost surely, 2^81608417670 is an apocalyptic number.

81608417670 is an abundant number, since it is smaller than the sum of its proper divisors (135018705210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81608417670 is a wasteful number, since it uses less digits than its factorization.

81608417670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655529.

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 81608417670 in words is "eighty-one billion, six hundred eight million, four hundred seventeen thousand, six hundred seventy".