618820557444825 has 48 divisors (see below), whose sum is σ = 1037266940595456. Its totient is φ = 325498451968000.

The previous prime is 618820557444787. The next prime is 618820557444829. The reversal of 618820557444825 is 528444755028816.

It is a happy number.

It is not a de Polignac number, because 618820557444825 - 2⁷ = 618820557444697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 618820557444825.

It is not an unprimeable number, because it can be changed into a prime (618820557444829) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156988017 + ... + 160881566.

It is an arithmetic number, because the mean of its divisors is an integer number (21609727929072).

Almost surely, 2^{618820557444825} is an apocalyptic number.

It is an amenable number.

618820557444825 is a deficient number, since it is larger than the sum of its proper divisors (418446383150631).

618820557444825 is a wasteful number, since it uses less digits than its factorization.

618820557444825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317869954 (or 317869949 counting only the distinct ones).

The product of its (nonzero) digits is 688128000, while the sum is 69.

The spelling of 618820557444825 in words is "six hundred eighteen trillion, eight hundred twenty billion, five hundred fifty-seven million, four hundred forty-four thousand, eight hundred twenty-five".