261786687162 has 64 divisors (see below), whose sum is σ = 702979651584. Its totient is φ = 62766037440.

The previous prime is 261786687137. The next prime is 261786687179.

261786687162 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×261786687162² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261786687096 and 261786687105.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21787758 + ... + 21799769.

It is an arithmetic number, because the mean of its divisors is an integer number (10984057056).

Almost surely, 2^261786687162 is an apocalyptic number.

261786687162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261786687162 is an abundant number, since it is smaller than the sum of its proper divisors (441192964422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261786687162 is a wasteful number, since it uses less digits than its factorization.

261786687162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43587563.

The product of its digits is 16257024, while the sum is 60.

The spelling of 261786687162 in words is "two hundred sixty-one billion, seven hundred eighty-six million, six hundred eighty-seven thousand, one hundred sixty-two".