197582407978 has 32 divisors (see below), whose sum is σ = 310962960000. Its totient is φ = 94034001600.

The previous prime is 197582407903. The next prime is 197582408021. The reversal of 197582407978 is 879704285791.

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, 1179553 + ... + 1336603.

It is an arithmetic number, because the mean of its divisors is an integer number (9717592500).

Almost surely, 2^197582407978 is an apocalyptic number.

197582407978 is a deficient number, since it is larger than the sum of its proper divisors (113380552022).

197582407978 is a wasteful number, since it uses less digits than its factorization.

197582407978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157390.

The product of its (nonzero) digits is 71124480, while the sum is 67.

The spelling of 197582407978 in words is "one hundred ninety-seven billion, five hundred eighty-two million, four hundred seven thousand, nine hundred seventy-eight".