19997440101937 has 16 divisors (see below), whose sum is σ = 20455269028992. Its totient is φ = 19543900360320.

The previous prime is 19997440101923. The next prime is 19997440102021. The reversal of 19997440101937 is 73910104479991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19997440101937 is a prime.

It is a super-2 number, since 2×19997440101937² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19997440101917) 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, 24795558 + ... + 25589344.

It is an arithmetic number, because the mean of its divisors is an integer number (1278454314312).

Almost surely, 2^{19997440101937} is an apocalyptic number.

It is an amenable number.

19997440101937 is a deficient number, since it is larger than the sum of its proper divisors (457828927055).

19997440101937 is a wasteful number, since it uses less digits than its factorization.

19997440101937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796488.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The spelling of 19997440101937 in words is "nineteen trillion, nine hundred ninety-seven billion, four hundred forty million, one hundred one thousand, nine hundred thirty-seven".