265889997 has 6 divisors (see below), whose sum is σ = 384063342. Its totient is φ = 177259992.

The previous prime is 265889993. The next prime is 265889999. The reversal of 265889997 is 799988562.

It can be written as a sum of positive squares in only one way, i.e., 249292521 + 16597476 = 15789^2 + 4074^2 .

It is not a de Polignac number, because 265889997 - 2² = 265889993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265889993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14771658 + ... + 14771675.

It is an arithmetic number, because the mean of its divisors is an integer number (64010557).

Almost surely, 2^265889997 is an apocalyptic number.

It is an amenable number.

265889997 is a deficient number, since it is larger than the sum of its proper divisors (118173345).

265889997 is a wasteful number, since it uses less digits than its factorization.

265889997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29543339 (or 29543336 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 265889997 is about 16306.1337232343. The cubic root of 265889997 is about 643.0340934898.

It can be divided in two parts, 26588 and 9997, that added together give a triangular number (36585 = T₂₇₀).

The spelling of 265889997 in words is "two hundred sixty-five million, eight hundred eighty-nine thousand, nine hundred ninety-seven".