402144434257 has 2 divisors, whose sum is σ = 402144434258. Its totient is φ = 402144434256.

The previous prime is 402144434213. The next prime is 402144434267. The reversal of 402144434257 is 752434441204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292741595136 + 109402839121 = 541056^2 + 330761^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144434257 - 2¹⁵ = 402144401489 is a prime.

It is not a weakly prime, because it can be changed into another prime (402144434267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201072217128 + 201072217129.

It is an arithmetic number, because the mean of its divisors is an integer number (201072217129).

Almost surely, 2^402144434257 is an apocalyptic number.

It is an amenable number.

402144434257 is a deficient number, since it is larger than the sum of its proper divisors (1).

402144434257 is an equidigital number, since it uses as much as digits as its factorization.

402144434257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 40.

The spelling of 402144434257 in words is "four hundred two billion, one hundred forty-four million, four hundred thirty-four thousand, two hundred fifty-seven".