1618648669 has 16 divisors (see below), whose sum is σ = 1783345536. Its totient is φ = 1456948800.

The previous prime is 1618648631. The next prime is 1618648679. The reversal of 1618648669 is 9668468161.

It is a cyclic number.

It is not a de Polignac number, because 1618648669 - 2⁷ = 1618648541 is a prime.

It is a super-2 number, since 2×1618648669² = 5240047027310943122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618648679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507259 + ... + 510439.

It is an arithmetic number, because the mean of its divisors is an integer number (111459096).

Almost surely, 2^1618648669 is an apocalyptic number.

It is an amenable number.

1618648669 is a deficient number, since it is larger than the sum of its proper divisors (164696867).

1618648669 is a wasteful number, since it uses less digits than its factorization.

1618648669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its digits is 2985984, while the sum is 55.

The square root of 1618648669 is about 40232.4330484747. The cubic root of 1618648669 is about 1174.1336408903.

The spelling of 1618648669 in words is "one billion, six hundred eighteen million, six hundred forty-eight thousand, six hundred sixty-nine".