261268087487 has 16 divisors (see below), whose sum is σ = 300040053120. Its totient is φ = 225001116000.

The previous prime is 261268087469. The next prime is 261268087501. The reversal of 261268087487 is 784780862162.

It is not a de Polignac number, because 261268087487 - 2²⁰ = 261267038911 is a prime.

It is a super-2 number, since 2×261268087487² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261268087427) 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, 4380488 + ... + 4439730.

It is an arithmetic number, because the mean of its divisors is an integer number (18752503320).

Almost surely, 2^261268087487 is an apocalyptic number.

261268087487 is a deficient number, since it is larger than the sum of its proper divisors (38771965633).

261268087487 is a wasteful number, since it uses less digits than its factorization.

261268087487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80374.

The product of its (nonzero) digits is 14450688, while the sum is 59.

The spelling of 261268087487 in words is "two hundred sixty-one billion, two hundred sixty-eight million, eighty-seven thousand, four hundred eighty-seven".