2155616495549 has 16 divisors (see below), whose sum is σ = 2372983262784. Its totient is φ = 1941825312000.

The previous prime is 2155616495533. The next prime is 2155616495563. The reversal of 2155616495549 is 9455946165512.

It is a cyclic number.

It is not a de Polignac number, because 2155616495549 - 2⁴ = 2155616495533 is a prime.

It is a super-2 number, since 2×2155616495549² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2155616495491 and 2155616495500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155615495549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4821347 + ... + 5249439.

It is an arithmetic number, because the mean of its divisors is an integer number (148311453924).

Almost surely, 2^{2155616495549} is an apocalyptic number.

It is an amenable number.

2155616495549 is a deficient number, since it is larger than the sum of its proper divisors (217366767235).

2155616495549 is a wasteful number, since it uses less digits than its factorization.

2155616495549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432268.

The product of its digits is 58320000, while the sum is 62.

The spelling of 2155616495549 in words is "two trillion, one hundred fifty-five billion, six hundred sixteen million, four hundred ninety-five thousand, five hundred forty-nine".