997437643524 has 405 divisors, whose sum is σ = 3049937258823. Its totient is φ = 274831214112.

The previous prime is 997437643511. The next prime is 997437643549. The reversal of 997437643524 is 425346734799.

It is a happy number.

The square root of 997437643524 is 998718.

It is a perfect power (a square), and thus also a powerful number.

997437643524 is a `hidden beast` number, since 9 + 9 + 7 + 43 + 7 + 64 + 3 + 524 = 666.

997437643524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 134 ways as a sum of consecutive naturals, for example, 12625792917 + ... + 12625792995.

Almost surely, 2^997437643524 is an apocalyptic number.

997437643524 is the 998718-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997437643524

997437643524 is an abundant number, since it is smaller than the sum of its proper divisors (2052499615299).

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

997437643524 is an equidigital number, since it uses as much as digits as its factorization.

997437643524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 134 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 63.

It can be divided in two parts, 997437 and 643524, that added together give a square (1640961 = 1281²).

The spelling of 997437643524 in words is "nine hundred ninety-seven billion, four hundred thirty-seven million, six hundred forty-three thousand, five hundred twenty-four".