1683756816961 has 4 divisors (see below), whose sum is σ = 1738071553024. Its totient is φ = 1629442080900.

The previous prime is 1683756816953. The next prime is 1683756816971. The reversal of 1683756816961 is 1696186573861.

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 1683756816961 - 2³ = 1683756816953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1683756816901) 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, 27157367985 + ... + 27157368046.

It is an arithmetic number, because the mean of its divisors is an integer number (434517888256).

Almost surely, 2^{1683756816961} is an apocalyptic number.

It is an amenable number.

1683756816961 is a deficient number, since it is larger than the sum of its proper divisors (54314736063).

1683756816961 is an equidigital number, since it uses as much as digits as its factorization.

1683756816961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54314736062.

The product of its digits is 78382080, while the sum is 67.

The spelling of 1683756816961 in words is "one trillion, six hundred eighty-three billion, seven hundred fifty-six million, eight hundred sixteen thousand, nine hundred sixty-one".