1629680665 has 16 divisors (see below), whose sum is σ = 2025492480. Its totient is φ = 1257269440.

The previous prime is 1629680653. The next prime is 1629680677. The reversal of 1629680665 is 5660869261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1629680653) and next prime (1629680677).

It is not a de Polignac number, because 1629680665 - 2⁹ = 1629680153 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 122280 + ... + 134950.

It is an arithmetic number, because the mean of its divisors is an integer number (126593280).

Almost surely, 2^1629680665 is an apocalyptic number.

It is an amenable number.

1629680665 is a deficient number, since it is larger than the sum of its proper divisors (395811815).

1629680665 is a wasteful number, since it uses less digits than its factorization.

1629680665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13592.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1629680665 is about 40369.3034990697. The cubic root of 1629680665 is about 1176.7950628116.

The spelling of 1629680665 in words is "one billion, six hundred twenty-nine million, six hundred eighty thousand, six hundred sixty-five".