1621536166 has 16 divisors (see below), whose sum is σ = 2481164784. Its totient is φ = 794517984.

The previous prime is 1621536151. The next prime is 1621536173. The reversal of 1621536166 is 6616351261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84241 + ... + 101683.

It is an arithmetic number, because the mean of its divisors is an integer number (155072799).

Almost surely, 2^1621536166 is an apocalyptic number.

1621536166 is a deficient number, since it is larger than the sum of its proper divisors (859628618).

1621536166 is a wasteful number, since it uses less digits than its factorization.

1621536166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375.

The product of its digits is 38880, while the sum is 37.

The square root of 1621536166 is about 40268.3022487912. The cubic root of 1621536166 is about 1174.8314026392.

The spelling of 1621536166 in words is "one billion, six hundred twenty-one million, five hundred thirty-six thousand, one hundred sixty-six".