3965697856837 has 16 divisors (see below), whose sum is σ = 3984741961200. Its totient is φ = 3946708684800.

The previous prime is 3965697856831. The next prime is 3965697856847. The reversal of 3965697856837 is 7386587965693.

It is a Cunningham number, because it is equal to 1991406²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 54357057316 + 3911340799521 = 233146^2 + 1977711^2 .

It is a cyclic number.

It is not a de Polignac number, because 3965697856837 - 2²³ = 3965689468229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965697856831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389667493 + ... + 389677669.

It is an arithmetic number, because the mean of its divisors is an integer number (249046372575).

Almost surely, 2^{3965697856837} is an apocalyptic number.

It is an amenable number.

3965697856837 is a deficient number, since it is larger than the sum of its proper divisors (19044104363).

3965697856837 is a wasteful number, since it uses less digits than its factorization.

3965697856837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12696.

The product of its digits is 12345177600, while the sum is 82.

The spelling of 3965697856837 in words is "three trillion, nine hundred sixty-five billion, six hundred ninety-seven million, eight hundred fifty-six thousand, eight hundred thirty-seven".