1661014004 has 24 divisors (see below), whose sum is σ = 3134857320. Its totient is φ = 765523584.

The previous prime is 1661013967. The next prime is 1661014073. The reversal of 1661014004 is 4004101661.

It can be written as a sum of positive squares in 4 ways, for example, as 12816400 + 1648197604 = 3580^2 + 40598^2 .

It is a super-2 number, since 2×1661014004² = 5517935042968224032, which contains 22 as substring.

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, 14342 + ... + 59394.

It is an arithmetic number, because the mean of its divisors is an integer number (130619055).

Almost surely, 2^1661014004 is an apocalyptic number.

It is an amenable number.

1661014004 is a deficient number, since it is larger than the sum of its proper divisors (1473843316).

1661014004 is a wasteful number, since it uses less digits than its factorization.

1661014004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45779 (or 45777 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1661014004 is about 40755.5395498575. The cubic root of 1661014004 is about 1184.2891887425.

Adding to 1661014004 its reverse (4004101661), we get a palindrome (5665115665).

The spelling of 1661014004 in words is "one billion, six hundred sixty-one million, fourteen thousand, four".