16161604 has 6 divisors (see below), whose sum is σ = 28282814. Its totient is φ = 8080800.

The previous prime is 16161589. The next prime is 16161623. The reversal of 16161604 is 40616161.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 161604 = 4000^2 + 402^2 .

It is a super-2 number, since 2×16161604² = 522394887705632, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2020197 + ... + 2020204.

Almost surely, 2^16161604 is an apocalyptic number.

It is an amenable number.

16161604 is a deficient number, since it is larger than the sum of its proper divisors (12121210).

16161604 is a wasteful number, since it uses less digits than its factorization.

16161604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040405 (or 4040403 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 16161604 is about 4020.1497484547. The cubic root of 16161604 is about 252.8297374955.

Adding to 16161604 its reverse (40616161), we get a palindrome (56777765).

It can be divided in two parts, 16 and 161604, that multiplied together give a square (2585664 = 1608²).

The spelling of 16161604 in words is "sixteen million, one hundred sixty-one thousand, six hundred four".