1670720567 has 4 divisors (see below), whose sum is σ = 1678016520. Its totient is φ = 1663424616.

The previous prime is 1670720561. The next prime is 1670720573. The reversal of 1670720567 is 7650270761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7650270761 = 7 ⋅1092895823.

It is an interprime number because it is at equal distance from previous prime (1670720561) and next prime (1670720573).

It is a cyclic number.

It is not a de Polignac number, because 1670720567 - 2⁶ = 1670720503 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 (1670720561) 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, 3647633 + ... + 3648090.

It is an arithmetic number, because the mean of its divisors is an integer number (419504130).

Almost surely, 2^1670720567 is an apocalyptic number.

1670720567 is a deficient number, since it is larger than the sum of its proper divisors (7295953).

1670720567 is an equidigital number, since it uses as much as digits as its factorization.

1670720567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7295952.

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 1670720567 is about 40874.4488280882. The cubic root of 1670720567 is about 1186.5916092201.

The spelling of 1670720567 in words is "one billion, six hundred seventy million, seven hundred twenty thousand, five hundred sixty-seven".