1665717970 has 48 divisors (see below), whose sum is σ = 3640086720. Its totient is φ = 537502464.

The previous prime is 1665717943. The next prime is 1665718051. The reversal of 1665717970 is 797175661.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20940 + ... + 61399.

It is an arithmetic number, because the mean of its divisors is an integer number (75835140).

Almost surely, 2^1665717970 is an apocalyptic number.

1665717970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665717970 is an abundant number, since it is smaller than the sum of its proper divisors (1974368750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665717970 is a wasteful number, since it uses less digits than its factorization.

1665717970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82387 (or 82370 counting only the distinct ones).

The product of its (nonzero) digits is 555660, while the sum is 49.

The square root of 1665717970 is about 40813.2082786933. The cubic root of 1665717970 is about 1185.4060979445.

The spelling of 1665717970 in words is "one billion, six hundred sixty-five million, seven hundred seventeen thousand, nine hundred seventy".