40538961261 has 12 divisors (see below), whose sum is σ = 58561940892. Its totient is φ = 27023360256.

The previous prime is 40538961247. The next prime is 40538961319. The reversal of 40538961261 is 16216983504.

40538961261 is a `hidden beast` number, since 4 + 0 + 5 + 389 + 6 + 1 + 261 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13706555625 + 26832405636 = 117075^2 + 163806^2 .

It is not a de Polignac number, because 40538961261 - 2²⁵ = 40505406829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40538261261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117156 + ... + 307901.

It is an arithmetic number, because the mean of its divisors is an integer number (4880161741).

Almost surely, 2^40538961261 is an apocalyptic number.

It is an amenable number.

40538961261 is a deficient number, since it is larger than the sum of its proper divisors (18022979631).

40538961261 is a wasteful number, since it uses less digits than its factorization.

40538961261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435660 (or 435657 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 40538961261 in words is "forty billion, five hundred thirty-eight million, nine hundred sixty-one thousand, two hundred sixty-one".