2154426661 has 2 divisors, whose sum is σ = 2154426662. Its totient is φ = 2154426660.

The previous prime is 2154426613. The next prime is 2154426679. The reversal of 2154426661 is 1666244512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1596002500 + 558424161 = 39950^2 + 23631^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154426661 - 2¹⁷ = 2154295589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2154426661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154426161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077213330 + 1077213331.

It is an arithmetic number, because the mean of its divisors is an integer number (1077213331).

Almost surely, 2^2154426661 is an apocalyptic number.

It is an amenable number.

2154426661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154426661 is an equidigital number, since it uses as much as digits as its factorization.

2154426661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

The square root of 2154426661 is about 46415.8018459231. The cubic root of 2154426661 is about 1291.5480605868.

It can be divided in two parts, 21544 and 26661, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 2154426661 in words is "two billion, one hundred fifty-four million, four hundred twenty-six thousand, six hundred sixty-one".