618861416 has 8 divisors (see below), whose sum is σ = 1160365170. Its totient is φ = 309430704.

The previous prime is 618861413. The next prime is 618861433. The reversal of 618861416 is 614168816.

It can be written as a sum of positive squares in only one way, i.e., 612760516 + 6100900 = 24754^2 + 2470^2 .

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

It is not an unprimeable number, because it can be changed into a prime (618861413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38678831 + ... + 38678846.

Almost surely, 2^618861416 is an apocalyptic number.

It is an amenable number.

618861416 is a deficient number, since it is larger than the sum of its proper divisors (541503754).

618861416 is a wasteful number, since it uses less digits than its factorization.

618861416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77357683 (or 77357679 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 618861416 is about 24876.9253727224. The cubic root of 618861416 is about 852.1796038888.

The spelling of 618861416 in words is "six hundred eighteen million, eight hundred sixty-one thousand, four hundred sixteen".