405666435356253 has 12 divisors (see below), whose sum is σ = 592003480692988. Its totient is φ = 267656204770560.

The previous prime is 405666435356239. The next prime is 405666435356291. The reversal of 405666435356253 is 352653534666504.

It can be written as a sum of positive squares in 2 ways, for example, as 337586163696324 + 68080271659929 = 18373518^2 + 8251077^2 .

It is not a de Polignac number, because 405666435356253 - 2⁸ = 405666435355997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405666435356153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232340454658 + ... + 232340456403.

Almost surely, 2^{405666435356253} is an apocalyptic number.

It is an amenable number.

405666435356253 is a deficient number, since it is larger than the sum of its proper divisors (186337045336735).

405666435356253 is a wasteful number, since it uses less digits than its factorization.

405666435356253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464680911164 (or 464680911161 counting only the distinct ones).

The product of its (nonzero) digits is 699840000, while the sum is 63.

The spelling of 405666435356253 in words is "four hundred five trillion, six hundred sixty-six billion, four hundred thirty-five million, three hundred fifty-six thousand, two hundred fifty-three".