39917644671993 has 16 divisors (see below), whose sum is σ = 61117924857600. Its totient is φ = 22919221820880.

The previous prime is 39917644671959. The next prime is 39917644672039.

39917644671993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 39917644671993 - 2¹² = 39917644667897 is a prime.

It is a super-2 number, since 2×39917644671993² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39917644676993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31832251903 + ... + 31832253156.

It is an arithmetic number, because the mean of its divisors is an integer number (3819870303600).

Almost surely, 2^{39917644671993} is an apocalyptic number.

39917644671993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

39917644671993 is a deficient number, since it is larger than the sum of its proper divisors (21200280185607).

39917644671993 is a wasteful number, since it uses less digits than its factorization.

39917644671993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63664505092.

The product of its digits is 1666598976, while the sum is 78.

The spelling of 39917644671993 in words is "thirty-nine trillion, nine hundred seventeen billion, six hundred forty-four million, six hundred seventy-one thousand, nine hundred ninety-three".