997740844800 has 864 divisors, whose sum is σ = 3846853785600. Its totient is φ = 223035310080.

The previous prime is 997740844799. The next prime is 997740844801. The reversal of 997740844800 is 8448047799.

It is an interprime number because it is at equal distance from previous prime (997740844799) and next prime (997740844801).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997740844801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1611858891 + ... + 1611859509.

Almost surely, 2^997740844800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997740844800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1923426892800).

997740844800 is an abundant number, since it is smaller than the sum of its proper divisors (2849112940800).

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

997740844800 is a wasteful number, since it uses less digits than its factorization.

997740844800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 997740844800 in words is "nine hundred ninety-seven billion, seven hundred forty million, eight hundred forty-four thousand, eight hundred".