261980748466 has 16 divisors (see below), whose sum is σ = 414278415360. Its totient is φ = 124067751840.

The previous prime is 261980748461. The next prime is 261980748529. The reversal of 261980748466 is 664847089162.

It is a super-2 number, since 2×261980748466² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261980748461) 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, 44949171 + ... + 44954998.

It is an arithmetic number, because the mean of its divisors is an integer number (25892400960).

Almost surely, 2^261980748466 is an apocalyptic number.

261980748466 is a deficient number, since it is larger than the sum of its proper divisors (152297666894).

261980748466 is a wasteful number, since it uses less digits than its factorization.

261980748466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89904249.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 261980748466 in words is "two hundred sixty-one billion, nine hundred eighty million, seven hundred forty-eight thousand, four hundred sixty-six".