1979290665 has 24 divisors (see below), whose sum is σ = 3742659648. Its totient is φ = 959655840.

The previous prime is 1979290657. The next prime is 1979290673. The reversal of 1979290665 is 5660929791.

It is an interprime number because it is at equal distance from previous prime (1979290657) and next prime (1979290673).

It is not a de Polignac number, because 1979290665 - 2³ = 1979290657 is a prime.

It is a super-2 number, since 2×1979290665² = 7835183073112284450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1998789 + ... + 1999778.

It is an arithmetic number, because the mean of its divisors is an integer number (155944152).

Almost surely, 2^1979290665 is an apocalyptic number.

1979290665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1979290665 is a deficient number, since it is larger than the sum of its proper divisors (1763368983).

1979290665 is a wasteful number, since it uses less digits than its factorization.

1979290665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998589 (or 3998586 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The square root of 1979290665 is about 44489.2196492589. The cubic root of 1979290665 is about 1255.5572653611.

The spelling of 1979290665 in words is "one billion, nine hundred seventy-nine million, two hundred ninety thousand, six hundred sixty-five".