197781215076 has 135 divisors (see below), whose sum is σ = 534927043497. Its totient is φ = 63720341280.

The previous prime is 197781215059. The next prime is 197781215083. The reversal of 197781215076 is 670512187791.

The square root of 197781215076 is 444726.

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

197781215076 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 8 + 121 + 507 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 95907896100 + 101873318976 = 309690^2 + 319176^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 248156710 + ... + 248157506.

Almost surely, 2^197781215076 is an apocalyptic number.

197781215076 is the 444726-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197781215076

197781215076 is an abundant number, since it is smaller than the sum of its proper divisors (337145828421).

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

197781215076 is an frugal number, since it uses more digits than its factorization.

197781215076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 54.

The spelling of 197781215076 in words is "one hundred ninety-seven billion, seven hundred eighty-one million, two hundred fifteen thousand, seventy-six".