265720545 has 12 divisors (see below), whose sum is σ = 460582356. Its totient is φ = 141717600.

The previous prime is 265720501. The next prime is 265720583. The reversal of 265720545 is 545027562.

It can be written as a sum of positive squares in 2 ways, for example, as 212488929 + 53231616 = 14577^2 + 7296^2 .

It is not a de Polignac number, because 265720545 - 2⁹ = 265720033 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2952406 + ... + 2952495.

It is an arithmetic number, because the mean of its divisors is an integer number (38381863).

Almost surely, 2^265720545 is an apocalyptic number.

It is an amenable number.

265720545 is a deficient number, since it is larger than the sum of its proper divisors (194861811).

265720545 is a wasteful number, since it uses less digits than its factorization.

265720545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904912 (or 5904909 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 265720545 is about 16300.9369362623. The cubic root of 265720545 is about 642.8974623389.

It can be divided in two parts, 2657205 and 45, that multiplied together give a square (119574225 = 10935²).

The spelling of 265720545 in words is "two hundred sixty-five million, seven hundred twenty thousand, five hundred forty-five".