1661502301 has 4 divisors (see below), whose sum is σ = 1663221472. Its totient is φ = 1659783132.

The previous prime is 1661502287. The next prime is 1661502341. The reversal of 1661502301 is 1032051661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1032051661 = 5897 ⋅175013.

It is a cyclic number.

It is not a de Polignac number, because 1661502301 - 2²⁵ = 1627947869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661502341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858135 + ... + 860068.

It is an arithmetic number, because the mean of its divisors is an integer number (415805368).

Almost surely, 2^1661502301 is an apocalyptic number.

It is an amenable number.

1661502301 is a deficient number, since it is larger than the sum of its proper divisors (1719171).

1661502301 is an equidigital number, since it uses as much as digits as its factorization.

1661502301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719170.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1661502301 is about 40761.5296695303. The cubic root of 1661502301 is about 1184.4052279408.

Adding to 1661502301 its reverse (1032051661), we get a palindrome (2693553962).

The spelling of 1661502301 in words is "one billion, six hundred sixty-one million, five hundred two thousand, three hundred one".