618816649201 has 9 divisors (see below), whose sum is σ = 620878998649. Its totient is φ = 616761135364.

The previous prime is 618816649189. The next prime is 618816649219. The reversal of 618816649201 is 102946618816.

The square root of 618816649201 is 786649.

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

It is not a de Polignac number, because 618816649201 - 2³⁵ = 584456910833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618816649601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 272966070 + ... + 272968336.

Almost surely, 2^618816649201 is an apocalyptic number.

618816649201 is the 786649-th square number.

618816649201 is the 393325-th centered octagonal number.

It is an amenable number.

618816649201 is a deficient number, since it is larger than the sum of its proper divisors (2062349448).

618816649201 is an frugal number, since it uses more digits than its factorization.

618816649201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5228 (or 2614 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 618816649201 in words is "six hundred eighteen billion, eight hundred sixteen million, six hundred forty-nine thousand, two hundred one".