2155631634365 has 16 divisors (see below), whose sum is σ = 2987912940480. Its totient is φ = 1475512561920.

The previous prime is 2155631634347. The next prime is 2155631634371. The reversal of 2155631634365 is 5634361365512.

It is not a de Polignac number, because 2155631634365 - 2¹⁴ = 2155631617981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1152743255 + ... + 1152745124.

It is an arithmetic number, because the mean of its divisors is an integer number (186744558780).

Almost surely, 2^{2155631634365} is an apocalyptic number.

It is an amenable number.

2155631634365 is a deficient number, since it is larger than the sum of its proper divisors (832281306115).

2155631634365 is a wasteful number, since it uses less digits than its factorization.

2155631634365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305488412.

The product of its digits is 5832000, while the sum is 50.

Adding to 2155631634365 its reverse (5634361365512), we get a palindrome (7789992999877).

The spelling of 2155631634365 in words is "two trillion, one hundred fifty-five billion, six hundred thirty-one million, six hundred thirty-four thousand, three hundred sixty-five".