667421049 has 4 divisors (see below), whose sum is σ = 889894736. Its totient is φ = 444947364.

The previous prime is 667421047. The next prime is 667421099. The reversal of 667421049 is 940124766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 667421049 - 2¹ = 667421047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667420998 and 667421016.

It is not an unprimeable number, because it can be changed into a prime (667421047) 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, 111236839 + ... + 111236844.

It is an arithmetic number, because the mean of its divisors is an integer number (222473684).

Almost surely, 2^667421049 is an apocalyptic number.

It is an amenable number.

667421049 is a deficient number, since it is larger than the sum of its proper divisors (222473687).

667421049 is a wasteful number, since it uses less digits than its factorization.

667421049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222473686.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 667421049 is about 25834.4933954587. The cubic root of 667421049 is about 873.9098473620.

The spelling of 667421049 in words is "six hundred sixty-seven million, four hundred twenty-one thousand, forty-nine".