403545554215421 has 2 divisors, whose sum is σ = 403545554215422. Its totient is φ = 403545554215420.

The previous prime is 403545554215381. The next prime is 403545554215541. The reversal of 403545554215421 is 124512455545304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313257645235396 + 90287908980025 = 17699086^2 + 9501995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403545554215421 is a prime.

It is a super-3 number, since 3×403545554215421³ (a number of 45 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 403545554215421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403545554212421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201772777107710 + 201772777107711.

It is an arithmetic number, because the mean of its divisors is an integer number (201772777107711).

Almost surely, 2^{403545554215421} is an apocalyptic number.

It is an amenable number.

403545554215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

403545554215421 is an equidigital number, since it uses as much as digits as its factorization.

403545554215421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600000, while the sum is 50.

The spelling of 403545554215421 in words is "four hundred three trillion, five hundred forty-five billion, five hundred fifty-four million, two hundred fifteen thousand, four hundred twenty-one".