265121267551 has 16 divisors (see below), whose sum is σ = 315281009664. Its totient is φ = 218215299744.

The previous prime is 265121267503. The next prime is 265121267557. The reversal of 265121267551 is 155762121562.

It is a cyclic number.

It is not a de Polignac number, because 265121267551 - 2¹⁵ = 265121234783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 265121267498 and 265121267507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265121267557) 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, 7584825 + ... + 7619698.

It is an arithmetic number, because the mean of its divisors is an integer number (19705063104).

Almost surely, 2^265121267551 is an apocalyptic number.

265121267551 is a deficient number, since it is larger than the sum of its proper divisors (50159742113).

265121267551 is a wasteful number, since it uses less digits than its factorization.

265121267551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15204630.

The product of its digits is 252000, while the sum is 43.

The spelling of 265121267551 in words is "two hundred sixty-five billion, one hundred twenty-one million, two hundred sixty-seven thousand, five hundred fifty-one".