261154216056 has 64 divisors (see below), whose sum is σ = 662300064000. Its totient is φ = 85804316928.

The previous prime is 261154216049. The next prime is 261154216061. The reversal of 261154216056 is 650612451162.

It is a super-3 number, since 3×261154216056³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255516 + ... + 766548.

It is an arithmetic number, because the mean of its divisors is an integer number (10348438500).

Almost surely, 2^261154216056 is an apocalyptic number.

It is a pronic number, being equal to 511032×511033.

It is an amenable number.

261154216056 is an abundant number, since it is smaller than the sum of its proper divisors (401145847944).

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

261154216056 is a wasteful number, since it uses less digits than its factorization.

261154216056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511348 (or 511344 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 261154216056 in words is "two hundred sixty-one billion, one hundred fifty-four million, two hundred sixteen thousand, fifty-six".