16372638397 has 4 divisors (see below), whose sum is σ = 16476922876. Its totient is φ = 16268353920.

The previous prime is 16372638383. The next prime is 16372638407. The reversal of 16372638397 is 79383627361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79383627361 = 72421 ⋅1096141.

It can be written as a sum of positive squares in 2 ways, for example, as 10302047001 + 6070591396 = 101499^2 + 77914^2 .

It is a cyclic number.

It is not a de Polignac number, because 16372638397 - 2²⁷ = 16238420669 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 (16372638497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52142004 + ... + 52142317.

It is an arithmetic number, because the mean of its divisors is an integer number (4119230719).

Almost surely, 2^16372638397 is an apocalyptic number.

It is an amenable number.

16372638397 is a deficient number, since it is larger than the sum of its proper divisors (104284479).

16372638397 is a wasteful number, since it uses less digits than its factorization.

16372638397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104284478.

The product of its digits is 6858432, while the sum is 55.

The spelling of 16372638397 in words is "sixteen billion, three hundred seventy-two million, six hundred thirty-eight thousand, three hundred ninety-seven".