2155775551 has 2 divisors, whose sum is σ = 2155775552. Its totient is φ = 2155775550.

The previous prime is 2155775471. The next prime is 2155775561. The reversal of 2155775551 is 1555775512.

2155775551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2155775551 - 2²¹ = 2153678399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155775498 and 2155775507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155775561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077887775 + 1077887776.

It is an arithmetic number, because the mean of its divisors is an integer number (1077887776).

Almost surely, 2^2155775551 is an apocalyptic number.

2155775551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155775551 is an equidigital number, since it uses as much as digits as its factorization.

2155775551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306250, while the sum is 43.

The square root of 2155775551 is about 46430.3300763628. The cubic root of 2155775551 is about 1291.8175511250.

The spelling of 2155775551 in words is "two billion, one hundred fifty-five million, seven hundred seventy-five thousand, five hundred fifty-one".