997448571504 has 1440 divisors, whose sum is σ = 3778858137600. Its totient is φ = 245067863040.

The previous prime is 997448571487. The next prime is 997448571619. The reversal of 997448571504 is 405175844799.

997448571504 is a `hidden beast` number, since 9 + 9 + 7 + 4 + 4 + 8 + 571 + 50 + 4 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 14887292079 + ... + 14887292145.

It is an arithmetic number, because the mean of its divisors is an integer number (2624207040).

Almost surely, 2^997448571504 is an apocalyptic number.

997448571504 is a gapful number since it is divisible by the number (94) 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 997448571504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889429068800).

997448571504 is an abundant number, since it is smaller than the sum of its proper divisors (2781409566096).

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

997448571504 is a wasteful number, since it uses less digits than its factorization.

997448571504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 997448571504 in words is "nine hundred ninety-seven billion, four hundred forty-eight million, five hundred seventy-one thousand, five hundred four".