1686477861 has 32 divisors (see below), whose sum is σ = 2633472000. Its totient is φ = 1065040704.

The previous prime is 1686477851. The next prime is 1686477869. The reversal of 1686477861 is 1687746861.

1686477861 is a `hidden beast` number, since 16 + 86 + 477 + 86 + 1 = 666.

It is not a de Polignac number, because 1686477861 - 2⁹ = 1686477349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686477798 and 1686477807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686477869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21180 + ... + 61818.

It is an arithmetic number, because the mean of its divisors is an integer number (82296000).

Almost surely, 2^1686477861 is an apocalyptic number.

It is an amenable number.

1686477861 is a deficient number, since it is larger than the sum of its proper divisors (946994139).

1686477861 is a wasteful number, since it uses less digits than its factorization.

1686477861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40730 (or 40724 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1686477861 is about 41066.7488486732. The cubic root of 1686477861 is about 1190.3103634602.

The spelling of 1686477861 in words is "one billion, six hundred eighty-six million, four hundred seventy-seven thousand, eight hundred sixty-one".