197408694781 has 16 divisors (see below), whose sum is σ = 200279620800. Its totient is φ = 194562362880.

The previous prime is 197408694683. The next prime is 197408694829. The reversal of 197408694781 is 187496804791.

It is a cyclic number.

It is not a de Polignac number, because 197408694781 - 2⁹ = 197408694269 is a prime.

It is a super-2 number, since 2×197408694781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197408697781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15610221 + ... + 15622861.

It is an arithmetic number, because the mean of its divisors is an integer number (12517476300).

Almost surely, 2^197408694781 is an apocalyptic number.

It is an amenable number.

197408694781 is a deficient number, since it is larger than the sum of its proper divisors (2870926019).

197408694781 is a wasteful number, since it uses less digits than its factorization.

197408694781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13596.

The product of its (nonzero) digits is 24385536, while the sum is 64.

The spelling of 197408694781 in words is "one hundred ninety-seven billion, four hundred eight million, six hundred ninety-four thousand, seven hundred eighty-one".