261836638162 has 64 divisors (see below), whose sum is σ = 458568760320. Its totient is φ = 110806528000.

The previous prime is 261836638123. The next prime is 261836638171.

261836638162 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×261836638162² (a number of 24 digits) contains 22 as substring.

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, 54354378 + ... + 54359194.

It is an arithmetic number, because the mean of its divisors is an integer number (7165136880).

Almost surely, 2^261836638162 is an apocalyptic number.

261836638162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261836638162 is a deficient number, since it is larger than the sum of its proper divisors (196732122158).

261836638162 is a wasteful number, since it uses less digits than its factorization.

261836638162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387.

The product of its digits is 2985984, while the sum is 52.

It can be divided in two parts, 261836 and 638162, that added together give a palindrome (899998).

The spelling of 261836638162 in words is "two hundred sixty-one billion, eight hundred thirty-six million, six hundred thirty-eight thousand, one hundred sixty-two".