261054532615 has 8 divisors (see below), whose sum is σ = 324067695840. Its totient is φ = 201642121632.

The previous prime is 261054532591. The next prime is 261054532631. The reversal of 261054532615 is 516235450162.

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

It is not a de Polignac number, because 261054532615 - 2¹¹ = 261054530567 is a prime.

It is a super-3 number, since 3×261054532615³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900187899 + ... + 900188188.

It is an arithmetic number, because the mean of its divisors is an integer number (40508461980).

Almost surely, 2^261054532615 is an apocalyptic number.

261054532615 is a deficient number, since it is larger than the sum of its proper divisors (63013163225).

261054532615 is a wasteful number, since it uses less digits than its factorization.

261054532615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800376121.

The product of its (nonzero) digits is 216000, while the sum is 40.

Adding to 261054532615 its reverse (516235450162), we get a palindrome (777289982777).

The spelling of 261054532615 in words is "two hundred sixty-one billion, fifty-four million, five hundred thirty-two thousand, six hundred fifteen".