16440121737 has 24 divisors (see below), whose sum is σ = 25688242944. Its totient is φ = 10071614304.

The previous prime is 16440121699. The next prime is 16440121771. The reversal of 16440121737 is 73712104461.

16440121737 is a `hidden beast` number, since 1 + 6 + 4 + 401 + 217 + 37 = 666.

It is not a de Polignac number, because 16440121737 - 2¹⁶ = 16440056201 is a prime.

It is a super-3 number, since 3×16440121737³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16440121937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288963 + ... + 341144.

It is an arithmetic number, because the mean of its divisors is an integer number (1070343456).

Almost surely, 2^16440121737 is an apocalyptic number.

It is an amenable number.

16440121737 is a deficient number, since it is larger than the sum of its proper divisors (9248121207).

16440121737 is a wasteful number, since it uses less digits than its factorization.

16440121737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630349 (or 630346 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 16440121737 in words is "sixteen billion, four hundred forty million, one hundred twenty-one thousand, seven hundred thirty-seven".