3555998649 has 90 divisors (see below), whose sum is σ = 6203682810. Its totient is φ = 1962442944.

The previous prime is 3555998609. The next prime is 3555998657. The reversal of 3555998649 is 9468995553.

3555998649 is a `hidden beast` number, since 35 + 5 + 599 + 8 + 6 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2557122624 + 998876025 = 50568^2 + 31605^2 .

It is not a de Polignac number, because 3555998649 - 2¹³ = 3555990457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (3555998609) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 39954997 + ... + 39955085.

It is an arithmetic number, because the mean of its divisors is an integer number (68929809).

Almost surely, 2^3555998649 is an apocalyptic number.

It is an amenable number.

3555998649 is a deficient number, since it is larger than the sum of its proper divisors (2647684161).

3555998649 is an frugal number, since it uses more digits than its factorization.

3555998649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 142 counting only the distinct ones).

The product of its digits is 52488000, while the sum is 63.

The square root of 3555998649 is about 59632.1947357298. The cubic root of 3555998649 is about 1526.3490560263.

The spelling of 3555998649 in words is "three billion, five hundred fifty-five million, nine hundred ninety-eight thousand, six hundred forty-nine".