667521111705353 has 4 divisors (see below), whose sum is σ = 667548767242260. Its totient is φ = 667493456168448.

The previous prime is 667521111705293. The next prime is 667521111705373. The reversal of 667521111705353 is 353507111125766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 528575413229824 + 138945698475529 = 22990768^2 + 11787523^2 .

It is a cyclic number.

It is not a de Polignac number, because 667521111705353 - 2¹⁸ = 667521111443209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667521111705295 and 667521111705304.

It is not an unprimeable number, because it can be changed into a prime (667521111705373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13827732248 + ... + 13827780521.

It is an arithmetic number, because the mean of its divisors is an integer number (166887191810565).

Almost surely, 2^{667521111705353} is an apocalyptic number.

It is an amenable number.

667521111705353 is a deficient number, since it is larger than the sum of its proper divisors (27655536907).

667521111705353 is a wasteful number, since it uses less digits than its factorization.

667521111705353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27655536906.

The product of its (nonzero) digits is 3969000, while the sum is 53.

The spelling of 667521111705353 in words is "six hundred sixty-seven trillion, five hundred twenty-one billion, one hundred eleven million, seven hundred five thousand, three hundred fifty-three".