3656213452261 has 2 divisors, whose sum is σ = 3656213452262. Its totient is φ = 3656213452260.

The previous prime is 3656213452189. The next prime is 3656213452273. The reversal of 3656213452261 is 1622543126563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3028939948225 + 627273504036 = 1740385^2 + 792006^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656213452261 - 2²⁵ = 3656179897829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3656213452961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828106726130 + 1828106726131.

It is an arithmetic number, because the mean of its divisors is an integer number (1828106726131).

Almost surely, 2^{3656213452261} is an apocalyptic number.

It is an amenable number.

3656213452261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656213452261 is an equidigital number, since it uses as much as digits as its factorization.

3656213452261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 46.

The spelling of 3656213452261 in words is "three trillion, six hundred fifty-six billion, two hundred thirteen million, four hundred fifty-two thousand, two hundred sixty-one".