261279010851277 has 16 divisors (see below), whose sum is σ = 263456007598080. Its totient is φ = 259109449869312.

The previous prime is 261279010851253. The next prime is 261279010851307. The reversal of 261279010851277 is 772158010972162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261279010851277 - 2⁷ = 261279010851149 is a prime.

It is a super-2 number, since 2×261279010851277² (a number of 30 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 (261279010821277) 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, 194291124 + ... + 195631282.

It is an arithmetic number, because the mean of its divisors is an integer number (16466000474880).

Almost surely, 2^{261279010851277} is an apocalyptic number.

It is an amenable number.

261279010851277 is a deficient number, since it is larger than the sum of its proper divisors (2176996746803).

261279010851277 is a wasteful number, since it uses less digits than its factorization.

261279010851277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342932.

The product of its (nonzero) digits is 5927040, while the sum is 58.

The spelling of 261279010851277 in words is "two hundred sixty-one trillion, two hundred seventy-nine billion, ten million, eight hundred fifty-one thousand, two hundred seventy-seven".