197719477620 has 72 divisors (see below), whose sum is σ = 644000593824. Its totient is φ = 45193022784.

The previous prime is 197719477589. The next prime is 197719477639. The reversal of 197719477620 is 26774917791.

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

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, 33622822 + ... + 33628701.

It is an arithmetic number, because the mean of its divisors is an integer number (8944452692).

Almost surely, 2^197719477620 is an apocalyptic number.

197719477620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197719477620 is an abundant number, since it is smaller than the sum of its proper divisors (446281116204).

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

197719477620 is a wasteful number, since it uses less digits than its factorization.

197719477620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67251549 (or 67251540 counting only the distinct ones).

The product of its (nonzero) digits is 9335088, while the sum is 60.

The spelling of 197719477620 in words is "one hundred ninety-seven billion, seven hundred nineteen million, four hundred seventy-seven thousand, six hundred twenty".