197666193761 has 16 divisors (see below), whose sum is σ = 209357119488. Its totient is φ = 186331698000.

The previous prime is 197666193733. The next prime is 197666193787. The reversal of 197666193761 is 167391666791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197666193761 is a prime.

It is a super-2 number, since 2×197666193761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197666193694 and 197666193703.

It is not an unprimeable number, because it can be changed into a prime (197666193731) 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, 287186 + ... + 691236.

It is an arithmetic number, because the mean of its divisors is an integer number (13084819968).

Almost surely, 2^197666193761 is an apocalyptic number.

It is an amenable number.

197666193761 is a deficient number, since it is larger than the sum of its proper divisors (11690925727).

197666193761 is a wasteful number, since it uses less digits than its factorization.

197666193761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404492.

The product of its digits is 15431472, while the sum is 62.

The spelling of 197666193761 in words is "one hundred ninety-seven billion, six hundred sixty-six million, one hundred ninety-three thousand, seven hundred sixty-one".