356121405261 has 12 divisors (see below), whose sum is σ = 514434325600. Its totient is φ = 237397313160.

The previous prime is 356121405229. The next prime is 356121405271. The reversal of 356121405261 is 162504121653.

356121405261 is a `hidden beast` number, since 3 + 5 + 6 + 121 + 4 + 0 + 526 + 1 = 666.

It is not a de Polignac number, because 356121405261 - 2⁵ = 356121405229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (356121405271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1279411 + ... + 1532688.

Almost surely, 2^356121405261 is an apocalyptic number.

It is an amenable number.

356121405261 is a deficient number, since it is larger than the sum of its proper divisors (158312920339).

356121405261 is a wasteful number, since it uses less digits than its factorization.

356121405261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826176 (or 2826173 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 356121405261 in words is "three hundred fifty-six billion, one hundred twenty-one million, four hundred five thousand, two hundred sixty-one".