1625661535 has 16 divisors (see below), whose sum is σ = 1983252096. Its totient is φ = 1278956448.

The previous prime is 1625661517. The next prime is 1625661571. The reversal of 1625661535 is 5351665261.

It is a cyclic number.

It is not a de Polignac number, because 1625661535 - 2⁵ = 1625661503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211632 + ... + 219178.

It is an arithmetic number, because the mean of its divisors is an integer number (123953256).

Almost surely, 2^1625661535 is an apocalyptic number.

1625661535 is a deficient number, since it is larger than the sum of its proper divisors (357590561).

1625661535 is an equidigital number, since it uses as much as digits as its factorization.

1625661535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262.

The product of its digits is 162000, while the sum is 40.

The square root of 1625661535 is about 40319.4932383828. The cubic root of 1625661535 is about 1175.8268596718.

The spelling of 1625661535 in words is "one billion, six hundred twenty-five million, six hundred sixty-one thousand, five hundred thirty-five".