1681407473777 has 8 divisors (see below), whose sum is σ = 1742848284672. Its totient is φ = 1620416779200.

The previous prime is 1681407473731. The next prime is 1681407473951. The reversal of 1681407473777 is 7773747041861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681407473777 - 2²⁸ = 1681139038321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681407473717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112521473 + ... + 112536414.

It is an arithmetic number, because the mean of its divisors is an integer number (217856035584).

Almost surely, 2^{1681407473777} is an apocalyptic number.

It is an amenable number.

1681407473777 is a deficient number, since it is larger than the sum of its proper divisors (61440810895).

1681407473777 is a wasteful number, since it uses less digits than its factorization.

1681407473777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225058159.

The product of its (nonzero) digits is 38723328, while the sum is 62.

The spelling of 1681407473777 in words is "one trillion, six hundred eighty-one billion, four hundred seven million, four hundred seventy-three thousand, seven hundred seventy-seven".