197851664613 has 4 divisors (see below), whose sum is σ = 263802219488. Its totient is φ = 131901109740.

The previous prime is 197851664603. The next prime is 197851664617. The reversal of 197851664613 is 316466158791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 197851664613 - 2²⁰ = 197850616037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197851664617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32975277433 + ... + 32975277438.

It is an arithmetic number, because the mean of its divisors is an integer number (65950554872).

Almost surely, 2^197851664613 is an apocalyptic number.

It is an amenable number.

197851664613 is a deficient number, since it is larger than the sum of its proper divisors (65950554875).

197851664613 is an equidigital number, since it uses as much as digits as its factorization.

197851664613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65950554874.

The product of its digits is 6531840, while the sum is 57.

The spelling of 197851664613 in words is "one hundred ninety-seven billion, eight hundred fifty-one million, six hundred sixty-four thousand, six hundred thirteen".