39965769991 has 6 divisors (see below), whose sum is σ = 46490793720. Its totient is φ = 34256374236.

The previous prime is 39965769947. The next prime is 39965770037. The reversal of 39965769991 is 19996756993.

It is not a de Polignac number, because 39965769991 - 2¹⁷ = 39965638919 is a prime.

It is a super-2 number, since 2×39965769991² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39965769901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 407813931 + ... + 407814028.

It is an arithmetic number, because the mean of its divisors is an integer number (7748465620).

Almost surely, 2^39965769991 is an apocalyptic number.

39965769991 is a deficient number, since it is larger than the sum of its proper divisors (6525023729).

39965769991 is an equidigital number, since it uses as much as digits as its factorization.

39965769991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815627973 (or 815627966 counting only the distinct ones).

The product of its digits is 223205220, while the sum is 73.

The spelling of 39965769991 in words is "thirty-nine billion, nine hundred sixty-five million, seven hundred sixty-nine thousand, nine hundred ninety-one".