1660121201 has 8 divisors (see below), whose sum is σ = 1713030984. Its totient is φ = 1607802880.

The previous prime is 1660121159. The next prime is 1660121237. The reversal of 1660121201 is 1021210661.

It can be written as a sum of positive squares in 4 ways, for example, as 1677025 + 1658444176 = 1295^2 + 40724^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660121201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1660121261) 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, 142160 + ... + 153393.

It is an arithmetic number, because the mean of its divisors is an integer number (214128873).

Almost surely, 2^1660121201 is an apocalyptic number.

It is an amenable number.

1660121201 is a deficient number, since it is larger than the sum of its proper divisors (52909783).

1660121201 is a wasteful number, since it uses less digits than its factorization.

1660121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295731.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1660121201 is about 40744.5849285522. The cubic root of 1660121201 is about 1184.0769636728.

Adding to 1660121201 its reverse (1021210661), we get a palindrome (2681331862).

The spelling of 1660121201 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, two hundred one".