1266161149 has 16 divisors (see below), whose sum is σ = 1421328384. Its totient is φ = 1118104000.

The previous prime is 1266161131. The next prime is 1266161167. The reversal of 1266161149 is 9411616621.

It is an interprime number because it is at equal distance from previous prime (1266161131) and next prime (1266161167).

It is a cyclic number.

It is not a de Polignac number, because 1266161149 - 2¹¹ = 1266159101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266161119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48132 + ... + 69634.

It is an arithmetic number, because the mean of its divisors is an integer number (88833024).

Almost surely, 2^1266161149 is an apocalyptic number.

It is an amenable number.

1266161149 is a deficient number, since it is larger than the sum of its proper divisors (155167235).

1266161149 is a wasteful number, since it uses less digits than its factorization.

1266161149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21668.

The product of its digits is 15552, while the sum is 37.

The square root of 1266161149 is about 35583.1582212709. The cubic root of 1266161149 is about 1081.8398990145.

It can be divided in two parts, 126616 and 1149, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1266161149 in words is "one billion, two hundred sixty-six million, one hundred sixty-one thousand, one hundred forty-nine".