2155640531633 has 32 divisors (see below), whose sum is σ = 2343277624320. Its totient is φ = 1978732903680.

The previous prime is 2155640531609. The next prime is 2155640531641. The reversal of 2155640531633 is 3361350465512.

It is a cyclic number.

It is not a de Polignac number, because 2155640531633 - 2¹⁶ = 2155640466097 is a prime.

It is a super-2 number, since 2×2155640531633² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2155640531833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9431258 + ... + 9657116.

It is an arithmetic number, because the mean of its divisors is an integer number (73227425760).

Almost surely, 2^{2155640531633} is an apocalyptic number.

It is an amenable number.

2155640531633 is a deficient number, since it is larger than the sum of its proper divisors (187637092687).

2155640531633 is a wasteful number, since it uses less digits than its factorization.

2155640531633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226137.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 2155640531633 in words is "two trillion, one hundred fifty-five billion, six hundred forty million, five hundred thirty-one thousand, six hundred thirty-three".