2155431474727 has 2 divisors, whose sum is σ = 2155431474728. Its totient is φ = 2155431474726.

The previous prime is 2155431474673. The next prime is 2155431474731. The reversal of 2155431474727 is 7274741345512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155431474727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155431474737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077715737363 + 1077715737364.

It is an arithmetic number, because the mean of its divisors is an integer number (1077715737364).

Almost surely, 2^{2155431474727} is an apocalyptic number.

2155431474727 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155431474727 is an equidigital number, since it uses as much as digits as its factorization.

2155431474727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6585600, while the sum is 52.

The spelling of 2155431474727 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-one million, four hundred seventy-four thousand, seven hundred twenty-seven".