618918649 has 8 divisors (see below), whose sum is σ = 627009728. Its totient is φ = 610880400.

The previous prime is 618918637. The next prime is 618918653. The reversal of 618918649 is 946819816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 618918649 - 2⁵ = 618918617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 618918596 and 618918605.

It is not an unprimeable number, because it can be changed into a prime (618918659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10654 + ... + 36760.

It is an arithmetic number, because the mean of its divisors is an integer number (78376216).

Almost surely, 2^618918649 is an apocalyptic number.

It is an amenable number.

618918649 is a deficient number, since it is larger than the sum of its proper divisors (8091079).

618918649 is a wasteful number, since it uses less digits than its factorization.

618918649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26415.

The product of its digits is 746496, while the sum is 52.

The square root of 618918649 is about 24878.0756691509. The cubic root of 618918649 is about 852.2058732552.

The spelling of 618918649 in words is "six hundred eighteen million, nine hundred eighteen thousand, six hundred forty-nine".