85366486640 has 20 divisors (see below), whose sum is σ = 198477081624. Its totient is φ = 34146594624.

The previous prime is 85366486553. The next prime is 85366486657. The reversal of 85366486640 is 4668466358.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533540462 + ... + 533540621.

Almost surely, 2^85366486640 is an apocalyptic number.

85366486640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85366486640 is an abundant number, since it is smaller than the sum of its proper divisors (113110594984).

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

85366486640 is a wasteful number, since it uses less digits than its factorization.

85366486640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067081096 (or 1067081090 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 85366486640 in words is "eighty-five billion, three hundred sixty-six million, four hundred eighty-six thousand, six hundred forty".