261573547355116 has 24 divisors (see below), whose sum is σ = 498461387886000. Its totient is φ = 119630733090624.

The previous prime is 261573547355069. The next prime is 261573547355137. The reversal of 261573547355116 is 611553745375162.

It is a super-2 number, since 2×261573547355116² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59340639211 + ... + 59340643618.

It is an arithmetic number, because the mean of its divisors is an integer number (20769224495250).

Almost surely, 2^{261573547355116} is an apocalyptic number.

It is an amenable number.

261573547355116 is a deficient number, since it is larger than the sum of its proper divisors (236887840530884).

261573547355116 is a wasteful number, since it uses less digits than its factorization.

261573547355116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118681282881 (or 118681282879 counting only the distinct ones).

The product of its digits is 79380000, while the sum is 61.

The spelling of 261573547355116 in words is "two hundred sixty-one trillion, five hundred seventy-three billion, five hundred forty-seven million, three hundred fifty-five thousand, one hundred sixteen".