1957666408811 has 4 divisors (see below), whose sum is σ = 1957669854624. Its totient is φ = 1957662963000.

The previous prime is 1957666408781. The next prime is 1957666408823. The reversal of 1957666408811 is 1188046667591.

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 1957666408811 - 2²² = 1957662214507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1957666408211) 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, 646580 + ... + 2081681.

It is an arithmetic number, because the mean of its divisors is an integer number (489417463656).

Almost surely, 2^{1957666408811} is an apocalyptic number.

1957666408811 is a deficient number, since it is larger than the sum of its proper divisors (3445813).

1957666408811 is an equidigital number, since it uses as much as digits as its factorization.

1957666408811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445812.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 1957666408811 in words is "one trillion, nine hundred fifty-seven billion, six hundred sixty-six million, four hundred eight thousand, eight hundred eleven".