1616618987 has 4 divisors (see below), whose sum is σ = 1616743320. Its totient is φ = 1616494656.

The previous prime is 1616618977. The next prime is 1616618999. The reversal of 1616618987 is 7898166161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7898166161 = 73 ⋅108194057.

It is a cyclic number.

It is not a de Polignac number, because 1616618987 - 2¹² = 1616614891 is a prime.

It is a super-2 number, since 2×1616618987² = 5226913898257812338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616618977) 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 3 ways as a sum of consecutive naturals, for example, 40037 + ... + 69542.

It is an arithmetic number, because the mean of its divisors is an integer number (404185830).

Almost surely, 2^1616618987 is an apocalyptic number.

1616618987 is a deficient number, since it is larger than the sum of its proper divisors (124333).

1616618987 is a wasteful number, since it uses less digits than its factorization.

1616618987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124332.

The product of its digits is 870912, while the sum is 53.

The square root of 1616618987 is about 40207.2006859468. The cubic root of 1616618987 is about 1173.6426727658.

It can be divided in two parts, 16166 and 18987, that added together give a palindrome (35153).

The spelling of 1616618987 in words is "one billion, six hundred sixteen million, six hundred eighteen thousand, nine hundred eighty-seven".