402506429561 has 2 divisors, whose sum is σ = 402506429562. Its totient is φ = 402506429560.

The previous prime is 402506429543. The next prime is 402506429569. The reversal of 402506429561 is 165924605204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220918800400 + 181587629161 = 470020^2 + 426131^2 .

It is a cyclic number.

It is not a de Polignac number, because 402506429561 - 2⁶ = 402506429497 is a prime.

It is a super-2 number, since 2×402506429561² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402506429569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201253214780 + 201253214781.

It is an arithmetic number, because the mean of its divisors is an integer number (201253214781).

Almost surely, 2^402506429561 is an apocalyptic number.

It is an amenable number.

402506429561 is a deficient number, since it is larger than the sum of its proper divisors (1).

402506429561 is an equidigital number, since it uses as much as digits as its factorization.

402506429561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 402506429561 in words is "four hundred two billion, five hundred six million, four hundred twenty-nine thousand, five hundred sixty-one".