1956989966291 has 4 divisors (see below), whose sum is σ = 1961180523432. Its totient is φ = 1952799409152.

The previous prime is 1956989966287. The next prime is 1956989966303. The reversal of 1956989966291 is 1926699896591.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1956989966291 - 2² = 1956989966287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1956989966201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2095277870 + ... + 2095278803.

It is an arithmetic number, because the mean of its divisors is an integer number (490295130858).

Almost surely, 2^{1956989966291} is an apocalyptic number.

1956989966291 is a deficient number, since it is larger than the sum of its proper divisors (4190557141).

1956989966291 is an equidigital number, since it uses as much as digits as its factorization.

1956989966291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190557140.

The product of its digits is 1020366720, while the sum is 80.

The spelling of 1956989966291 in words is "one trillion, nine hundred fifty-six billion, nine hundred eighty-nine million, nine hundred sixty-six thousand, two hundred ninety-one".