1666701667 has 8 divisors (see below), whose sum is σ = 1715130000. Its totient is φ = 1618451424.

The previous prime is 1666701661. The next prime is 1666701671. The reversal of 1666701667 is 7661076661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666701667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666701661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25417 + ... + 63082.

It is an arithmetic number, because the mean of its divisors is an integer number (214391250).

Almost surely, 2^1666701667 is an apocalyptic number.

1666701667 is a deficient number, since it is larger than the sum of its proper divisors (48428333).

1666701667 is an equidigital number, since it uses as much as digits as its factorization.

1666701667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89045.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 1666701667 is about 40825.2577089233. The cubic root of 1666701667 is about 1185.6394009353.

The spelling of 1666701667 in words is "one billion, six hundred sixty-six million, seven hundred one thousand, six hundred sixty-seven".