669746407 has 16 divisors (see below), whose sum is σ = 763458048. Its totient is φ = 581579680.

The previous prime is 669746401. The next prime is 669746411. The reversal of 669746407 is 704647966.

It is a happy number.

It is not a de Polignac number, because 669746407 - 2²³ = 661357799 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 (669746401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247353 + ... + 250045.

It is an arithmetic number, because the mean of its divisors is an integer number (47716128).

Almost surely, 2^669746407 is an apocalyptic number.

669746407 is a deficient number, since it is larger than the sum of its proper divisors (93711641).

669746407 is a wasteful number, since it uses less digits than its factorization.

669746407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The square root of 669746407 is about 25879.4591713196. The cubic root of 669746407 is about 874.9235990979.

The spelling of 669746407 in words is "six hundred sixty-nine million, seven hundred forty-six thousand, four hundred seven".