261429087611 has 8 divisors (see below), whose sum is σ = 268759570944. Its totient is φ = 254172277800.

The previous prime is 261429087593. The next prime is 261429087643. The reversal of 261429087611 is 116780924162.

It is a happy number.

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 261429087611 - 2⁶ = 261429087547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261429087671) 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, 18411185 + ... + 18425378.

It is an arithmetic number, because the mean of its divisors is an integer number (33594946368).

Almost surely, 2^261429087611 is an apocalyptic number.

261429087611 is a deficient number, since it is larger than the sum of its proper divisors (7330483333).

261429087611 is a wasteful number, since it uses less digits than its factorization.

261429087611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36836761.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 261429087611 in words is "two hundred sixty-one billion, four hundred twenty-nine million, eighty-seven thousand, six hundred eleven".