1689537537 has 12 divisors (see below), whose sum is σ = 2583998820. Its totient is φ = 1060101888.

The previous prime is 1689537491. The next prime is 1689537539. The reversal of 1689537537 is 7357359861.

1689537537 is a `hidden beast` number, since 16 + 8 + 95 + 3 + 7 + 537 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1585313856 + 104223681 = 39816^2 + 10209^2 .

It is not a de Polignac number, because 1689537537 - 2⁸ = 1689537281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1689537539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5521212 + ... + 5521517.

It is an arithmetic number, because the mean of its divisors is an integer number (215333235).

Almost surely, 2^1689537537 is an apocalyptic number.

1689537537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1689537537 is a deficient number, since it is larger than the sum of its proper divisors (894461283).

1689537537 is a wasteful number, since it uses less digits than its factorization.

1689537537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11042752 (or 11042749 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The square root of 1689537537 is about 41103.9844419005. The cubic root of 1689537537 is about 1191.0297648998.

The spelling of 1689537537 in words is "one billion, six hundred eighty-nine million, five hundred thirty-seven thousand, five hundred thirty-seven".