1670390555 has 4 divisors (see below), whose sum is σ = 2004468672. Its totient is φ = 1336312440.

The previous prime is 1670390551. The next prime is 1670390569. The reversal of 1670390555 is 5550930761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5550930761 = 4937 ⋅1124353.

It is not a de Polignac number, because 1670390555 - 2² = 1670390551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670390551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167039051 + ... + 167039060.

It is an arithmetic number, because the mean of its divisors is an integer number (501117168).

Almost surely, 2^1670390555 is an apocalyptic number.

1670390555 is a deficient number, since it is larger than the sum of its proper divisors (334078117).

1670390555 is an equidigital number, since it uses as much as digits as its factorization.

1670390555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334078116.

The product of its (nonzero) digits is 141750, while the sum is 41.

The square root of 1670390555 is about 40870.4117302481. The cubic root of 1670390555 is about 1186.5134762149.

The spelling of 1670390555 in words is "one billion, six hundred seventy million, three hundred ninety thousand, five hundred fifty-five".