265553321013 has 12 divisors (see below), whose sum is σ = 406140373548. Its totient is φ = 166621691520.

The previous prime is 265553320969. The next prime is 265553321021. The reversal of 265553321013 is 310123355562.

265553321013 is a `hidden beast` number, since 2 + 65 + 553 + 32 + 1 + 0 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138605056209 + 126948264804 = 372297^2 + 356298^2 .

It is not a de Polignac number, because 265553321013 - 2²⁵ = 265519766581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265553321063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 867821158 + ... + 867821463.

It is an arithmetic number, because the mean of its divisors is an integer number (33845031129).

Almost surely, 2^265553321013 is an apocalyptic number.

It is an amenable number.

265553321013 is a deficient number, since it is larger than the sum of its proper divisors (140587052535).

265553321013 is a wasteful number, since it uses less digits than its factorization.

265553321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735642644 (or 1735642641 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

Adding to 265553321013 its reverse (310123355562), we get a palindrome (575676676575).

The spelling of 265553321013 in words is "two hundred sixty-five billion, five hundred fifty-three million, three hundred twenty-one thousand, thirteen".