1681776654 has 64 divisors (see below), whose sum is σ = 3502559232. Its totient is φ = 538016000.

The previous prime is 1681776647. The next prime is 1681776667. The reversal of 1681776654 is 4566771861.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1681776597 and 1681776606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3901819 + ... + 3902249.

It is an arithmetic number, because the mean of its divisors is an integer number (54727488).

Almost surely, 2^1681776654 is an apocalyptic number.

1681776654 is an abundant number, since it is smaller than the sum of its proper divisors (1820782578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681776654 is a wasteful number, since it uses less digits than its factorization.

1681776654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its digits is 1693440, while the sum is 51.

The square root of 1681776654 is about 41009.4702965059. The cubic root of 1681776654 is about 1189.2033021511.

The spelling of 1681776654 in words is "one billion, six hundred eighty-one million, seven hundred seventy-six thousand, six hundred fifty-four".