1670578665 has 64 divisors (see below), whose sum is σ = 3195666432. Its totient is φ = 728640000.

The previous prime is 1670578643. The next prime is 1670578673. The reversal of 1670578665 is 5668750761.

It is not a de Polignac number, because 1670578665 - 2⁷ = 1670578537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1450840 + ... + 1451990.

It is an arithmetic number, because the mean of its divisors is an integer number (49932288).

Almost surely, 2^1670578665 is an apocalyptic number.

1670578665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1670578665 is a deficient number, since it is larger than the sum of its proper divisors (1525087767).

1670578665 is a wasteful number, since it uses less digits than its factorization.

1670578665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790.

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 1670578665 is about 40872.7129635408. The cubic root of 1670578665 is about 1186.5580140371.

The spelling of 1670578665 in words is "one billion, six hundred seventy million, five hundred seventy-eight thousand, six hundred sixty-five".