196156661 has 4 divisors (see below), whose sum is σ = 197568000. Its totient is φ = 194745324.

The previous prime is 196156633. The next prime is 196156679. The reversal of 196156661 is 166651691.

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 a cyclic number.

It is not a de Polignac number, because 196156661 - 2¹⁴ = 196140277 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 (196152661) 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, 705461 + ... + 705738.

It is an arithmetic number, because the mean of its divisors is an integer number (49392000).

Almost surely, 2^196156661 is an apocalyptic number.

It is an amenable number.

196156661 is a deficient number, since it is larger than the sum of its proper divisors (1411339).

196156661 is a wasteful number, since it uses less digits than its factorization.

196156661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411338.

The product of its digits is 58320, while the sum is 41.

The square root of 196156661 is about 14005.5939181457. The cubic root of 196156661 is about 581.0332957773.

The spelling of 196156661 in words is "one hundred ninety-six million, one hundred fifty-six thousand, six hundred sixty-one".