2155446666431 has 16 divisors (see below), whose sum is σ = 2221530109920. Its totient is φ = 2090396730240.

The previous prime is 2155446666427. The next prime is 2155446666481. The reversal of 2155446666431 is 1346666445512.

It is a cyclic number.

It is not a de Polignac number, because 2155446666431 - 2² = 2155446666427 is a prime.

It is a super-2 number, since 2×2155446666431² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155446666481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988996 + ... + 2875238.

It is an arithmetic number, because the mean of its divisors is an integer number (138845631870).

Almost surely, 2^{2155446666431} is an apocalyptic number.

2155446666431 is a deficient number, since it is larger than the sum of its proper divisors (66083443489).

2155446666431 is a wasteful number, since it uses less digits than its factorization.

2155446666431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886826.

The product of its digits is 12441600, while the sum is 53.

The spelling of 2155446666431 in words is "two trillion, one hundred fifty-five billion, four hundred forty-six million, six hundred sixty-six thousand, four hundred thirty-one".