16649644977 has 48 divisors (see below), whose sum is σ = 29695910400. Its totient is φ = 8954402688.

The previous prime is 16649644937. The next prime is 16649644987. The reversal of 16649644977 is 77944694661.

16649644977 is a `hidden beast` number, since 16 + 6 + 496 + 44 + 97 + 7 = 666.

It is not a de Polignac number, because 16649644977 - 2¹¹ = 16649642929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (16649644927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106153 + ... + 211110.

It is an arithmetic number, because the mean of its divisors is an integer number (618664800).

Almost surely, 2^16649644977 is an apocalyptic number.

16649644977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16649644977 is a deficient number, since it is larger than the sum of its proper divisors (13046265423).

16649644977 is a wasteful number, since it uses less digits than its factorization.

16649644977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317307 (or 317290 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The spelling of 16649644977 in words is "sixteen billion, six hundred forty-nine million, six hundred forty-four thousand, nine hundred seventy-seven".