197421657600 has 240 divisors, whose sum is σ = 666052155648. Its totient is φ = 51525181440.

The previous prime is 197421657581. The next prime is 197421657677. The reversal of 197421657600 is 6756124791.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 197421657600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1750107 + ... + 1859493.

Almost surely, 2^197421657600 is an apocalyptic number.

197421657600 is a gapful number since it is divisible by the number (10) 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 197421657600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333026077824).

197421657600 is an abundant number, since it is smaller than the sum of its proper divisors (468630498048).

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

197421657600 is a wasteful number, since it uses less digits than its factorization.

197421657600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109465 (or 109444 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 197421657600 in words is "one hundred ninety-seven billion, four hundred twenty-one million, six hundred fifty-seven thousand, six hundred".