265519278061 has 8 divisors (see below), whose sum is σ = 266690431800. Its totient is φ = 264348394752.

The previous prime is 265519278053. The next prime is 265519278077. The reversal of 265519278061 is 160872915562.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20543775561 + 244975502500 = 143331^2 + 494950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 265519278061 - 2³ = 265519278053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265519278091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2045451 + ... + 2171383.

It is an arithmetic number, because the mean of its divisors is an integer number (33336303975).

Almost surely, 2^265519278061 is an apocalyptic number.

It is an amenable number.

265519278061 is a deficient number, since it is larger than the sum of its proper divisors (1171153739).

265519278061 is a wasteful number, since it uses less digits than its factorization.

265519278061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135215.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 265519278061 in words is "two hundred sixty-five billion, five hundred nineteen million, two hundred seventy-eight thousand, sixty-one".