16348556691 has 6 divisors (see below), whose sum is σ = 23614581900. Its totient is φ = 10899037788.

The previous prime is 16348556647. The next prime is 16348556723. The reversal of 16348556691 is 19665584361.

16348556691 is a `hidden beast` number, since 16 + 3 + 485 + 5 + 66 + 91 = 666.

It is not a de Polignac number, because 16348556691 - 2¹⁷ = 16348425619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16348556611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 908253141 + ... + 908253158.

It is an arithmetic number, because the mean of its divisors is an integer number (3935763650).

Almost surely, 2^16348556691 is an apocalyptic number.

16348556691 is a deficient number, since it is larger than the sum of its proper divisors (7266025209).

16348556691 is a wasteful number, since it uses less digits than its factorization.

16348556691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816506305 (or 1816506302 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 16348556691 in words is "sixteen billion, three hundred forty-eight million, five hundred fifty-six thousand, six hundred ninety-one".