261151616 has 32 divisors (see below), whose sum is σ = 567562680. Its totient is φ = 118704640.

The previous prime is 261151613. The next prime is 261151619. The reversal of 261151616 is 616151162.

It is an interprime number because it is at equal distance from previous prime (261151613) and next prime (261151619).

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×261151616² = 136400333078822912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261151613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91331 + ... + 94146.

Almost surely, 2^261151616 is an apocalyptic number.

It is an amenable number.

261151616 is an abundant number, since it is smaller than the sum of its proper divisors (306411064).

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

261151616 is a wasteful number, since it uses less digits than its factorization.

261151616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185502 (or 185490 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 261151616 is about 16160.1861375419. The cubic root of 261151616 is about 639.1913745838.

The spelling of 261151616 in words is "two hundred sixty-one million, one hundred fifty-one thousand, six hundred sixteen".