667400013565442 has 4 divisors (see below), whose sum is σ = 1001100020348166. Its totient is φ = 333700006782720.

The previous prime is 667400013565393. The next prime is 667400013565451. The reversal of 667400013565442 is 244565310004766.

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

It can be written as a sum of positive squares in only one way, i.e., 656901564668281 + 10498448897161 = 25630091^2 + 3240131^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166850003391359 + ... + 166850003391362.

Almost surely, 2^{667400013565442} is an apocalyptic number.

667400013565442 is a deficient number, since it is larger than the sum of its proper divisors (333700006782724).

667400013565442 is a wasteful number, since it uses less digits than its factorization.

667400013565442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333700006782723.

The product of its (nonzero) digits is 14515200, while the sum is 53.

The spelling of 667400013565442 in words is "six hundred sixty-seven trillion, four hundred billion, thirteen million, five hundred sixty-five thousand, four hundred forty-two".