261085999458 has 16 divisors (see below), whose sum is σ = 529526534976. Its totient is φ = 85802910480.

The previous prime is 261085999441. The next prime is 261085999463. The reversal of 261085999458 is 854999580162.

It is a happy number.

It is a super-2 number, since 2×261085999458² (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 7 ways as a sum of consecutive naturals, for example, 306438541 + ... + 306439392.

It is an arithmetic number, because the mean of its divisors is an integer number (33095408436).

Almost surely, 2^261085999458 is an apocalyptic number.

261085999458 is an abundant number, since it is smaller than the sum of its proper divisors (268440535518).

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

261085999458 is a wasteful number, since it uses less digits than its factorization.

261085999458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612878009.

The product of its (nonzero) digits is 55987200, while the sum is 66.

The spelling of 261085999458 in words is "two hundred sixty-one billion, eighty-five million, nine hundred ninety-nine thousand, four hundred fifty-eight".