1661504301 has 12 divisors (see below), whose sum is σ = 2403634428. Its totient is φ = 1105969344.

The previous prime is 1661504293. The next prime is 1661504311. The reversal of 1661504301 is 1034051661.

1661504301 is a `hidden beast` number, since 1 + 6 + 615 + 0 + 43 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 751034025 + 910470276 = 27405^2 + 30174^2 .

It is not a de Polignac number, because 1661504301 - 2³ = 1661504293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661504311) 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 11 ways as a sum of consecutive naturals, for example, 135480 + ... + 147233.

It is an arithmetic number, because the mean of its divisors is an integer number (200302869).

Almost surely, 2^1661504301 is an apocalyptic number.

It is an amenable number.

1661504301 is a deficient number, since it is larger than the sum of its proper divisors (742130127).

1661504301 is a wasteful number, since it uses less digits than its factorization.

1661504301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283372 (or 283369 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1661504301 is about 40761.5542024590. The cubic root of 1661504301 is about 1184.4057031753.

Adding to 1661504301 its reverse (1034051661), we get a palindrome (2695555962).

The spelling of 1661504301 in words is "one billion, six hundred sixty-one million, five hundred four thousand, three hundred one".