265615513641 has 9 divisors (see below), whose sum is σ = 383669086359. Its totient is φ = 177075978336.

The previous prime is 265615513633. The next prime is 265615513693. The reversal of 265615513641 is 146315516562.

The square root of 265615513641 is 515379.

It is a perfect power (a square), and thus also a powerful number.

265615513641 is a `hidden beast` number, since 2 + 6 + 5 + 61 + 551 + 36 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 233680394025 + 31935119616 = 483405^2 + 178704^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 265615513641 - 2³ = 265615513633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265615313641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1460241 + ... + 1632033.

Almost surely, 2^265615513641 is an apocalyptic number.

265615513641 is the 515379-th square number.

265615513641 is the 257690-th centered octagonal number.

It is an amenable number.

265615513641 is a deficient number, since it is larger than the sum of its proper divisors (118053572718).

265615513641 is an frugal number, since it uses more digits than its factorization.

265615513641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343592 (or 171796 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 265615513641 in words is "two hundred sixty-five billion, six hundred fifteen million, five hundred thirteen thousand, six hundred forty-one".