261551107678335 has 64 divisors (see below), whose sum is σ = 421538795758080. Its totient is φ = 138476616445440.

The previous prime is 261551107678331. The next prime is 261551107678361. The reversal of 261551107678335 is 533876701155162.

It is not a de Polignac number, because 261551107678335 - 2² = 261551107678331 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261551107678331) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25317109120 + ... + 25317119450.

It is an arithmetic number, because the mean of its divisors is an integer number (6586543683720).

Almost surely, 2^{261551107678335} is an apocalyptic number.

261551107678335 is a deficient number, since it is larger than the sum of its proper divisors (159987688079745).

261551107678335 is a wasteful number, since it uses less digits than its factorization.

261551107678335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19448.

The product of its (nonzero) digits is 31752000, while the sum is 60.

The spelling of 261551107678335 in words is "two hundred sixty-one trillion, five hundred fifty-one billion, one hundred seven million, six hundred seventy-eight thousand, three hundred thirty-five".