1601625653 has 4 divisors (see below), whose sum is σ = 1685921760. Its totient is φ = 1517329548.

The previous prime is 1601625647. The next prime is 1601625671. The reversal of 1601625653 is 3565261061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3565261061 = 19 ⋅187645319.

It is a cyclic number.

It is not a de Polignac number, because 1601625653 - 2⁸ = 1601625397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601624653) 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, 42148025 + ... + 42148062.

It is an arithmetic number, because the mean of its divisors is an integer number (421480440).

Almost surely, 2^1601625653 is an apocalyptic number.

It is an amenable number.

1601625653 is a deficient number, since it is larger than the sum of its proper divisors (84296107).

1601625653 is an equidigital number, since it uses as much as digits as its factorization.

1601625653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84296106.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1601625653 is about 40020.3155035040. The cubic root of 1601625653 is about 1170.0030810545.

The spelling of 1601625653 in words is "one billion, six hundred one million, six hundred twenty-five thousand, six hundred fifty-three".