1961200605917 has 4 divisors (see below), whose sum is σ = 2241372121056. Its totient is φ = 1681029090780.

The previous prime is 1961200605911. The next prime is 1961200605919. The reversal of 1961200605917 is 7195060021691.

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 1961200605917 - 2⁶ = 1961200605853 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 (1961200605911) 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, 140085757559 + ... + 140085757572.

It is an arithmetic number, because the mean of its divisors is an integer number (560343030264).

Almost surely, 2^{1961200605917} is an apocalyptic number.

It is an amenable number.

1961200605917 is a deficient number, since it is larger than the sum of its proper divisors (280171515139).

1961200605917 is an equidigital number, since it uses as much as digits as its factorization.

1961200605917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280171515138.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 1961200605917 in words is "one trillion, nine hundred sixty-one billion, two hundred million, six hundred five thousand, nine hundred seventeen".