997955439210 has 192 divisors, whose sum is σ = 2759338483200. Its totient is φ = 249373403136.

The previous prime is 997955439079. The next prime is 997955439251. The reversal of 997955439210 is 12934559799.

997955439210 is a `hidden beast` number, since 9 + 9 + 79 + 5 + 543 + 9 + 2 + 10 = 666.

997955439210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 482336056 + ... + 482338124.

It is an arithmetic number, because the mean of its divisors is an integer number (14371554600).

Almost surely, 2^997955439210 is an apocalyptic number.

997955439210 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 997955439210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1379669241600).

997955439210 is an abundant number, since it is smaller than the sum of its proper divisors (1761383043990).

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

997955439210 is a wasteful number, since it uses less digits than its factorization.

997955439210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325 (or 3322 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 63.

The spelling of 997955439210 in words is "nine hundred ninety-seven billion, nine hundred fifty-five million, four hundred thirty-nine thousand, two hundred ten".