1521661163 has 16 divisors (see below), whose sum is σ = 1734759936. Its totient is φ = 1321203840.

The previous prime is 1521661147. The next prime is 1521661201. The reversal of 1521661163 is 3611661251.

It is not a de Polignac number, because 1521661163 - 2⁴ = 1521661147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521661363) 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, 179795 + ... + 188067.

It is an arithmetic number, because the mean of its divisors is an integer number (108422496).

Almost surely, 2^1521661163 is an apocalyptic number.

1521661163 is a deficient number, since it is larger than the sum of its proper divisors (213098773).

1521661163 is a wasteful number, since it uses less digits than its factorization.

1521661163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9034.

The product of its digits is 6480, while the sum is 32.

The square root of 1521661163 is about 39008.4755277619. The cubic root of 1521661163 is about 1150.1981165921.

The spelling of 1521661163 in words is "one billion, five hundred twenty-one million, six hundred sixty-one thousand, one hundred sixty-three".