401601660 has 24 divisors (see below), whose sum is σ = 1124484816. Its totient is φ = 107093760.

The previous prime is 401601653. The next prime is 401601679. The reversal of 401601660 is 66106104.

401601660 = 6676² + 6677² + ... + 6684².

It is a super-2 number, since 2×401601660² = 322567786629511200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401601660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3346621 + ... + 3346740.

It is an arithmetic number, because the mean of its divisors is an integer number (46853534).

Almost surely, 2^401601660 is an apocalyptic number.

It is an amenable number.

401601660 is an abundant number, since it is smaller than the sum of its proper divisors (722883156).

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

401601660 is a wasteful number, since it uses less digits than its factorization.

401601660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6693373 (or 6693371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 401601660 is about 20040.0014970059. The cubic root of 401601660 is about 737.7884176913.

Adding to 401601660 its reverse (66106104), we get a palindrome (467707764).

The spelling of 401601660 in words is "four hundred one million, six hundred one thousand, six hundred sixty".