197026421643 has 12 divisors (see below), whose sum is σ = 284629358520. Its totient is φ = 131334499296.

The previous prime is 197026421617. The next prime is 197026421659. The reversal of 197026421643 is 346124620791.

It is not a de Polignac number, because 197026421643 - 2¹² = 197026417547 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (197026421663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1294621 + ... + 1438782.

It is an arithmetic number, because the mean of its divisors is an integer number (23719113210).

Almost surely, 2^197026421643 is an apocalyptic number.

197026421643 is a deficient number, since it is larger than the sum of its proper divisors (87602936877).

197026421643 is a wasteful number, since it uses less digits than its factorization.

197026421643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741418 (or 2741415 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 197026421643 in words is "one hundred ninety-seven billion, twenty-six million, four hundred twenty-one thousand, six hundred forty-three".