1606689953 has 4 divisors (see below), whose sum is σ = 1752752688. Its totient is φ = 1460627220.

The previous prime is 1606689943. The next prime is 1606689967. The reversal of 1606689953 is 3599866061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1606689953 - 2⁴ = 1606689937 is a prime.

It is a super-2 number, since 2×1606689953² = 5162905210142284418, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1606689895 and 1606689904.

It is not an unprimeable number, because it can be changed into a prime (1606689943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73031351 + ... + 73031372.

It is an arithmetic number, because the mean of its divisors is an integer number (438188172).

Almost surely, 2^1606689953 is an apocalyptic number.

It is an amenable number.

1606689953 is a deficient number, since it is larger than the sum of its proper divisors (146062735).

1606689953 is a wasteful number, since it uses less digits than its factorization.

1606689953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146062734.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 1606689953 is about 40083.5371817408. The cubic root of 1606689953 is about 1171.2349570092.

The spelling of 1606689953 in words is "one billion, six hundred six million, six hundred eighty-nine thousand, nine hundred fifty-three".