618638879296 has 21 divisors (see below), whose sum is σ = 1227624012489. Its totient is φ = 309316293504.

The previous prime is 618638879293. The next prime is 618638879297. The reversal of 618638879296 is 692978836816.

The square root of 618638879296 is 786536.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 355740673600 + 262898205696 = 596440^2 + 512736^2 .

It is a super-2 number, since 2×618638879296² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618638879293) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6243130 + ... + 6341446.

It is an arithmetic number, because the mean of its divisors is an integer number (58458286309).

Almost surely, 2^618638879296 is an apocalyptic number.

618638879296 is the 786536-th square number.

It is an amenable number.

618638879296 is a deficient number, since it is larger than the sum of its proper divisors (608985133193).

618638879296 is an frugal number, since it uses more digits than its factorization.

618638879296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196646 (or 98319 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 73.

The spelling of 618638879296 in words is "six hundred eighteen billion, six hundred thirty-eight million, eight hundred seventy-nine thousand, two hundred ninety-six".