1660667497 has 8 divisors (see below), whose sum is σ = 1728003456. Its totient is φ = 1594665072.

The previous prime is 1660667473. The next prime is 1660667521. The reversal of 1660667497 is 7947660661.

It is an interprime number because it is at equal distance from previous prime (1660667473) and next prime (1660667521).

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

It is a cyclic number.

It is not a de Polignac number, because 1660667497 - 2⁷ = 1660667369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660667417) 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, 330843 + ... + 335824.

It is an arithmetic number, because the mean of its divisors is an integer number (216000432).

Almost surely, 2^1660667497 is an apocalyptic number.

It is an amenable number.

1660667497 is a deficient number, since it is larger than the sum of its proper divisors (67335959).

1660667497 is an equidigital number, since it uses as much as digits as its factorization.

1660667497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666767.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The square root of 1660667497 is about 40751.2882863843. The cubic root of 1660667497 is about 1184.2068308110.

The spelling of 1660667497 in words is "one billion, six hundred sixty million, six hundred sixty-seven thousand, four hundred ninety-seven".