1687646822401 has 4 divisors (see below), whose sum is σ = 1700529622704. Its totient is φ = 1674764022100.

The previous prime is 1687646822359. The next prime is 1687646822419. The reversal of 1687646822401 is 1042286467861.

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 1687646822401 - 2²⁹ = 1687109951489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687646822441) 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, 6441399955 + ... + 6441400216.

It is an arithmetic number, because the mean of its divisors is an integer number (425132405676).

Almost surely, 2^{1687646822401} is an apocalyptic number.

It is an amenable number.

1687646822401 is a deficient number, since it is larger than the sum of its proper divisors (12882800303).

1687646822401 is a wasteful number, since it uses less digits than its factorization.

1687646822401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12882800302.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 1687646822401 in words is "one trillion, six hundred eighty-seven billion, six hundred forty-six million, eight hundred twenty-two thousand, four hundred one".