402565551551 has 2 divisors, whose sum is σ = 402565551552. Its totient is φ = 402565551550.

The previous prime is 402565551491. The next prime is 402565551593. The reversal of 402565551551 is 155155565204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402565551551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402565557551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201282775775 + 201282775776.

It is an arithmetic number, because the mean of its divisors is an integer number (201282775776).

Almost surely, 2^402565551551 is an apocalyptic number.

402565551551 is a deficient number, since it is larger than the sum of its proper divisors (1).

402565551551 is an equidigital number, since it uses as much as digits as its factorization.

402565551551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750000, while the sum is 44.

The spelling of 402565551551 in words is "four hundred two billion, five hundred sixty-five million, five hundred fifty-one thousand, five hundred fifty-one".