1666498965 has 8 divisors (see below), whose sum is σ = 2666398368. Its totient is φ = 888799440.

The previous prime is 1666498963. The next prime is 1666498979. The reversal of 1666498965 is 5698946661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666498965 - 2¹ = 1666498963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666498899 and 1666498908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666498963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55549951 + ... + 55549980.

It is an arithmetic number, because the mean of its divisors is an integer number (333299796).

Almost surely, 2^1666498965 is an apocalyptic number.

1666498965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666498965 is a deficient number, since it is larger than the sum of its proper divisors (999899403).

1666498965 is a wasteful number, since it uses less digits than its factorization.

1666498965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111099939.

The product of its digits is 16796160, while the sum is 60.

The square root of 1666498965 is about 40822.7750771552. The cubic root of 1666498965 is about 1185.5913337005.

The spelling of 1666498965 in words is "one billion, six hundred sixty-six million, four hundred ninety-eight thousand, nine hundred sixty-five".