1660861646 has 8 divisors (see below), whose sum is σ = 2491624584. Its totient is φ = 830320120.

The previous prime is 1660861589. The next prime is 1660861651. The reversal of 1660861646 is 6461680661.

It is a happy number.

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

It is a super-2 number, since 2×1660861646² = 5516922814307658632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1660861597 and 1660861606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35120 + ... + 67491.

It is an arithmetic number, because the mean of its divisors is an integer number (311453073).

Almost surely, 2^1660861646 is an apocalyptic number.

1660861646 is a deficient number, since it is larger than the sum of its proper divisors (830762938).

1660861646 is a wasteful number, since it uses less digits than its factorization.

1660861646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110706.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 1660861646 is about 40753.6703377745. The cubic root of 1660861646 is about 1184.2529776392.

The spelling of 1660861646 in words is "one billion, six hundred sixty million, eight hundred sixty-one thousand, six hundred forty-six".