618138056 has 8 divisors (see below), whose sum is σ = 1159008870. Its totient is φ = 309069024.

The previous prime is 618138023. The next prime is 618138089. The reversal of 618138056 is 650831816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (618138023) and next prime (618138089).

It can be written as a sum of positive squares in only one way, i.e., 319193956 + 298944100 = 17866^2 + 17290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38633621 + ... + 38633636.

Almost surely, 2^618138056 is an apocalyptic number.

It is an amenable number.

618138056 is a deficient number, since it is larger than the sum of its proper divisors (540870814).

618138056 is a wasteful number, since it uses less digits than its factorization.

618138056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77267263 (or 77267259 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 618138056 is about 24862.3823476352. The cubic root of 618138056 is about 851.8474493051.

The spelling of 618138056 in words is "six hundred eighteen million, one hundred thirty-eight thousand, fifty-six".