618685749 has 16 divisors (see below), whose sum is σ = 999896640. Its totient is φ = 374960880.

The previous prime is 618685723. The next prime is 618685751. The reversal of 618685749 is 947586816.

618685749 is a `hidden beast` number, since 6 + 1 + 8 + 68 + 574 + 9 = 666.

It is not a de Polignac number, because 618685749 - 2¹² = 618681653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 618685695 and 618685704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618685799) 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 in 15 ways as a sum of consecutive naturals, for example, 1041262 + ... + 1041855.

It is an arithmetic number, because the mean of its divisors is an integer number (62493540).

Almost surely, 2^618685749 is an apocalyptic number.

It is an amenable number.

618685749 is a deficient number, since it is larger than the sum of its proper divisors (381210891).

618685749 is a wasteful number, since it uses less digits than its factorization.

618685749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083137 (or 2083131 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 618685749 is about 24873.3944004432. The cubic root of 618685749 is about 852.0989644019.

The spelling of 618685749 in words is "six hundred eighteen million, six hundred eighty-five thousand, seven hundred forty-nine".