1625648923 has 4 divisors (see below), whose sum is σ = 1632810600. Its totient is φ = 1618487248.

The previous prime is 1625648903. The next prime is 1625648929. The reversal of 1625648923 is 3298465261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625648923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625648929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3580498 + ... + 3580951.

It is an arithmetic number, because the mean of its divisors is an integer number (408202650).

Almost surely, 2^1625648923 is an apocalyptic number.

1625648923 is a deficient number, since it is larger than the sum of its proper divisors (7161677).

1625648923 is an equidigital number, since it uses as much as digits as its factorization.

1625648923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7161676.

The product of its digits is 622080, while the sum is 46.

The square root of 1625648923 is about 40319.3368373043. The cubic root of 1625648923 is about 1175.8238189473.

The spelling of 1625648923 in words is "one billion, six hundred twenty-five million, six hundred forty-eight thousand, nine hundred twenty-three".