261616898452 has 24 divisors (see below), whose sum is σ = 563482551296. Its totient is φ = 103496794848.

The previous prime is 261616898443. The next prime is 261616898453. The reversal of 261616898452 is 254898616162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261616898453) 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, 359363508 + ... + 359364235.

Almost surely, 2^261616898452 is an apocalyptic number.

It is an amenable number.

261616898452 is an abundant number, since it is smaller than the sum of its proper divisors (301865652844).

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

261616898452 is a wasteful number, since it uses less digits than its factorization.

261616898452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718727767 (or 718727765 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 58.

The spelling of 261616898452 in words is "two hundred sixty-one billion, six hundred sixteen million, eight hundred ninety-eight thousand, four hundred fifty-two".