3956757665 has 16 divisors (see below), whose sum is σ = 5528798208. Its totient is φ = 2662011456.

The previous prime is 3956757653. The next prime is 3956757671. The reversal of 3956757665 is 5667576593.

It is a cyclic number.

It is not a de Polignac number, because 3956757665 - 2¹² = 3956753569 is a prime.

It is a Duffinian 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, 1064657 + ... + 1068366.

It is an arithmetic number, because the mean of its divisors is an integer number (345549888).

Almost surely, 2^3956757665 is an apocalyptic number.

3956757665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3956757665 is a deficient number, since it is larger than the sum of its proper divisors (1572040543).

3956757665 is a wasteful number, since it uses less digits than its factorization.

3956757665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133088.

The product of its digits is 35721000, while the sum is 59.

The square root of 3956757665 is about 62902.7635720403. The cubic root of 3956757665 is about 1581.6600702046.

The spelling of 3956757665 in words is "three billion, nine hundred fifty-six million, seven hundred fifty-seven thousand, six hundred sixty-five".