1685010861 has 6 divisors (see below), whose sum is σ = 2433904590. Its totient is φ = 1123340568.

The previous prime is 1685010853. The next prime is 1685010863. The reversal of 1685010861 is 1680105861.

It can be written as a sum of positive squares in only one way, i.e., 1316601225 + 368409636 = 36285^2 + 19194^2 .

It is not a de Polignac number, because 1685010861 - 2³ = 1685010853 is a prime.

It is a super-2 number, since 2×1685010861² = 5678523203375922642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685010863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93611706 + ... + 93611723.

It is an arithmetic number, because the mean of its divisors is an integer number (405650765).

Almost surely, 2^1685010861 is an apocalyptic number.

It is an amenable number.

1685010861 is a deficient number, since it is larger than the sum of its proper divisors (748893729).

1685010861 is a wasteful number, since it uses less digits than its factorization.

1685010861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187223435 (or 187223432 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1685010861 is about 41048.8837972484. The cubic root of 1685010861 is about 1189.9651287948.

The spelling of 1685010861 in words is "one billion, six hundred eighty-five million, ten thousand, eight hundred sixty-one".