618725617 has 4 divisors (see below), whose sum is σ = 619002736. Its totient is φ = 618448500.

The previous prime is 618725609. The next prime is 618725689. The reversal of 618725617 is 716527816.

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.

It is a cyclic number.

It is not a de Polignac number, because 618725617 - 2³ = 618725609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618725417) 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 3 ways as a sum of consecutive naturals, for example, 135183 + ... + 139684.

It is an arithmetic number, because the mean of its divisors is an integer number (154750684).

Almost surely, 2^618725617 is an apocalyptic number.

It is an amenable number.

618725617 is a deficient number, since it is larger than the sum of its proper divisors (277119).

618725617 is a wasteful number, since it uses less digits than its factorization.

618725617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277118.

The product of its digits is 141120, while the sum is 43.

The square root of 618725617 is about 24874.1958060959. The cubic root of 618725617 is about 852.1172670442.

The spelling of 618725617 in words is "six hundred eighteen million, seven hundred twenty-five thousand, six hundred seventeen".