82666669440 has 256 divisors, whose sum is σ = 269096644800. Its totient is φ = 21578219520.

The previous prime is 82666669411. The next prime is 82666669453. The reversal of 82666669440 is 4496666628.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67262746 + ... + 67263974.

Almost surely, 2^82666669440 is an apocalyptic number.

82666669440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82666669440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134548322400).

82666669440 is an abundant number, since it is smaller than the sum of its proper divisors (186429975360).

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

82666669440 is a wasteful number, since it uses less digits than its factorization.

82666669440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 57.

The spelling of 82666669440 in words is "eighty-two billion, six hundred sixty-six million, six hundred sixty-nine thousand, four hundred forty".