261650443351131 has 40 divisors (see below), whose sum is σ = 413705252360400. Its totient is φ = 164339911903680.

The previous prime is 261650443351097. The next prime is 261650443351151. The reversal of 261650443351131 is 131153344056162.

261650443351131 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 504 + 4 + 3 + 3 + 5 + 1 + 131 = 666.

It is not a de Polignac number, because 261650443351131 - 2¹¹ = 261650443349083 is a prime.

It is a super-2 number, since 2×261650443351131² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261650443351151) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 469371396 + ... + 469928513.

It is an arithmetic number, because the mean of its divisors is an integer number (10342631309010).

Almost surely, 2^{261650443351131} is an apocalyptic number.

261650443351131 is a deficient number, since it is larger than the sum of its proper divisors (152054809009269).

261650443351131 is a wasteful number, since it uses less digits than its factorization.

261650443351131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939300121 (or 939300112 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 261650443351131 in words is "two hundred sixty-one trillion, six hundred fifty billion, four hundred forty-three million, three hundred fifty-one thousand, one hundred thirty-one".