1665479760 has 80 divisors (see below), whose sum is σ = 5900562816. Its totient is φ = 380680704.

The previous prime is 1665479747. The next prime is 1665479801. The reversal of 1665479760 is 679745661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493999 + ... + 497358.

Almost surely, 2^1665479760 is an apocalyptic number.

1665479760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665479760 is an abundant number, since it is smaller than the sum of its proper divisors (4235083056).

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

1665479760 is a wasteful number, since it uses less digits than its factorization.

1665479760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991380 (or 991374 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 51.

The square root of 1665479760 is about 40810.2898789019. The cubic root of 1665479760 is about 1185.3495879683.

The spelling of 1665479760 in words is "one billion, six hundred sixty-five million, four hundred seventy-nine thousand, seven hundred sixty".