266452397 has 4 divisors (see below), whose sum is σ = 266597436. Its totient is φ = 266307360.

The previous prime is 266452387. The next prime is 266452469. The reversal of 266452397 is 793254662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793254662 = 2 ⋅396627331.

It can be written as a sum of positive squares in 2 ways, for example, as 31933801 + 234518596 = 5651^2 + 15314^2 .

It is a cyclic number.

It is not a de Polignac number, because 266452397 - 2²⁰ = 265403821 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 (266452387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69728 + ... + 73449.

It is an arithmetic number, because the mean of its divisors is an integer number (66649359).

Almost surely, 2^266452397 is an apocalyptic number.

It is an amenable number.

266452397 is a deficient number, since it is larger than the sum of its proper divisors (145039).

266452397 is a wasteful number, since it uses less digits than its factorization.

266452397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145038.

The product of its digits is 544320, while the sum is 44.

The square root of 266452397 is about 16323.3696582538. The cubic root of 266452397 is about 643.4871476353.

The spelling of 266452397 in words is "two hundred sixty-six million, four hundred fifty-two thousand, three hundred ninety-seven".