1660161639 has 8 divisors (see below), whose sum is σ = 2343757680. Its totient is φ = 1041670016.

The previous prime is 1660161623. The next prime is 1660161641. The reversal of 1660161639 is 9361610661.

1660161639 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1660161639 - 2⁴ = 1660161623 is a prime.

It is a super-2 number, since 2×1660161639² = 5512273335214332642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1660161597 and 1660161606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660261639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16276044 + ... + 16276145.

It is an arithmetic number, because the mean of its divisors is an integer number (292969710).

Almost surely, 2^1660161639 is an apocalyptic number.

1660161639 is a deficient number, since it is larger than the sum of its proper divisors (683596041).

1660161639 is a wasteful number, since it uses less digits than its factorization.

1660161639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32552209.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1660161639 is about 40745.0811632521. The cubic root of 1660161639 is about 1184.0865776929.

The spelling of 1660161639 in words is "one billion, six hundred sixty million, one hundred sixty-one thousand, six hundred thirty-nine".