625153985 has 4 divisors (see below), whose sum is σ = 750184788. Its totient is φ = 500123184.

The previous prime is 625153981. The next prime is 625153987. The reversal of 625153985 is 589351526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589351526 = 2 ⋅294675763.

It can be written as a sum of positive squares in 2 ways, for example, as 338596801 + 286557184 = 18401^2 + 16928^2 .

It is a cyclic number.

It is not a de Polignac number, because 625153985 - 2² = 625153981 is a prime.

It is a super-2 number, since 2×625153985² = 781635009922760450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625153981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62515394 + ... + 62515403.

It is an arithmetic number, because the mean of its divisors is an integer number (187546197).

Almost surely, 2^625153985 is an apocalyptic number.

It is an amenable number.

625153985 is a deficient number, since it is larger than the sum of its proper divisors (125030803).

625153985 is a wasteful number, since it uses less digits than its factorization.

625153985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125030802.

The product of its digits is 324000, while the sum is 44.

The square root of 625153985 is about 25003.0795103323. The cubic root of 625153985 is about 855.0581837449.

The spelling of 625153985 in words is "six hundred twenty-five million, one hundred fifty-three thousand, nine hundred eighty-five".