402270565661 has 2 divisors, whose sum is σ = 402270565662. Its totient is φ = 402270565660.

The previous prime is 402270565607. The next prime is 402270565673. The reversal of 402270565661 is 166565072204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279634728025 + 122635837636 = 528805^2 + 350194^2 .

It is a cyclic number.

It is not a de Polignac number, because 402270565661 - 2²⁶ = 402203456797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402270565681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201135282830 + 201135282831.

It is an arithmetic number, because the mean of its divisors is an integer number (201135282831).

Almost surely, 2^402270565661 is an apocalyptic number.

It is an amenable number.

402270565661 is a deficient number, since it is larger than the sum of its proper divisors (1).

402270565661 is an equidigital number, since it uses as much as digits as its factorization.

402270565661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 402270565661 in words is "four hundred two billion, two hundred seventy million, five hundred sixty-five thousand, six hundred sixty-one".