1661304513 has 16 divisors (see below), whose sum is σ = 2521506816. Its totient is φ = 963074640.

The previous prime is 1661304503. The next prime is 1661304563. The reversal of 1661304513 is 3154031661.

It is not a de Polignac number, because 1661304513 - 2¹⁴ = 1661288129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661304503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1093645 + ... + 1095162.

It is an arithmetic number, because the mean of its divisors is an integer number (157594176).

Almost surely, 2^1661304513 is an apocalyptic number.

It is an amenable number.

1661304513 is a deficient number, since it is larger than the sum of its proper divisors (860202303).

1661304513 is a wasteful number, since it uses less digits than its factorization.

1661304513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188844.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1661304513 is about 40759.1034371464. The cubic root of 1661304513 is about 1184.3582282191.

The spelling of 1661304513 in words is "one billion, six hundred sixty-one million, three hundred four thousand, five hundred thirteen".