971639383680 has 512 divisors, whose sum is σ = 4007056780800. Its totient is φ = 217897205760.

The previous prime is 971639383667. The next prime is 971639383697. The reversal of 971639383680 is 86383936179.

971639383680 is a `hidden beast` number, since 97 + 1 + 6 + 393 + 83 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6335100 + ... + 6486660.

It is an arithmetic number, because the mean of its divisors is an integer number (7826282775).

Almost surely, 2^971639383680 is an apocalyptic number.

971639383680 is a gapful number since it is divisible by the number (90) 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 971639383680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2003528390400).

971639383680 is an abundant number, since it is smaller than the sum of its proper divisors (3035417397120).

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

971639383680 is a wasteful number, since it uses less digits than its factorization.

971639383680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151649 (or 151631 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 63.

The spelling of 971639383680 in words is "nine hundred seventy-one billion, six hundred thirty-nine million, three hundred eighty-three thousand, six hundred eighty".