16400073637 has 4 divisors (see below), whose sum is σ = 16400900236. Its totient is φ = 16399247040.

The previous prime is 16400073631. The next prime is 16400073643. The reversal of 16400073637 is 73637000461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73637000461 = 44939 ⋅1638599.

It is an interprime number because it is at equal distance from previous prime (16400073631) and next prime (16400073643).

It can be written as a sum of positive squares in 2 ways, for example, as 4105477476 + 12294596161 = 64074^2 + 110881^2 .

It is a cyclic number.

It is not a de Polignac number, because 16400073637 - 2¹⁹ = 16399549349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16400073596 and 16400073605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400073631) 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, 382788 + ... + 423469.

It is an arithmetic number, because the mean of its divisors is an integer number (4100225059).

Almost surely, 2^16400073637 is an apocalyptic number.

It is an amenable number.

16400073637 is a deficient number, since it is larger than the sum of its proper divisors (826599).

16400073637 is an equidigital number, since it uses as much as digits as its factorization.

16400073637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826598.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 16400073637 in words is "sixteen billion, four hundred million, seventy-three thousand, six hundred thirty-seven".