261533466331616 has 12 divisors (see below), whose sum is σ = 514894011840432. Its totient is φ = 130766733165792.

The previous prime is 261533466331583. The next prime is 261533466331699. The reversal of 261533466331616 is 616133664335162.

261533466331616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261533466331616² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086460411400 + ... + 4086460411463.

It is an arithmetic number, because the mean of its divisors is an integer number (42907834320036).

Almost surely, 2^{261533466331616} is an apocalyptic number.

It is an amenable number.

261533466331616 is a deficient number, since it is larger than the sum of its proper divisors (253360545508816).

261533466331616 is an equidigital number, since it uses as much as digits as its factorization.

261533466331616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172920822873 (or 8172920822865 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 56.

The spelling of 261533466331616 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, four hundred sixty-six million, three hundred thirty-one thousand, six hundred sixteen".