197578391466 has 32 divisors (see below), whose sum is σ = 401053776768. Its totient is φ = 64878166080.

The previous prime is 197578391453. The next prime is 197578391551. The reversal of 197578391466 is 664193875791.

It is a junction number, because it is equal to n+sod(n) for n = 197578391397 and 197578391406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325560 + ... + 707916.

It is an arithmetic number, because the mean of its divisors is an integer number (12532930524).

Almost surely, 2^197578391466 is an apocalyptic number.

197578391466 is an abundant number, since it is smaller than the sum of its proper divisors (203475385302).

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

197578391466 is a wasteful number, since it uses less digits than its factorization.

197578391466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383646.

The product of its digits is 68584320, while the sum is 66.

The spelling of 197578391466 in words is "one hundred ninety-seven billion, five hundred seventy-eight million, three hundred ninety-one thousand, four hundred sixty-six".