196988747261 has 4 divisors (see below), whose sum is σ = 196990177692. Its totient is φ = 196987316832.

The previous prime is 196988747237. The next prime is 196988747297. The reversal of 196988747261 is 162747889691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27157392025 + 169831355236 = 164795^2 + 412106^2 .

It is a cyclic number.

It is not a de Polignac number, because 196988747261 - 2¹⁰ = 196988746237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 196988747191 and 196988747200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196988747201) 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, 483656 + ... + 792401.

It is an arithmetic number, because the mean of its divisors is an integer number (49247544423).

Almost surely, 2^196988747261 is an apocalyptic number.

It is an amenable number.

196988747261 is a deficient number, since it is larger than the sum of its proper divisors (1430431).

196988747261 is a wasteful number, since it uses less digits than its factorization.

196988747261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430430.

The product of its digits is 73156608, while the sum is 68.

The spelling of 196988747261 in words is "one hundred ninety-six billion, nine hundred eighty-eight million, seven hundred forty-seven thousand, two hundred sixty-one".