16646237211077 has 4 divisors (see below), whose sum is σ = 17625427635276. Its totient is φ = 15667046786880.

The previous prime is 16646237211059. The next prime is 16646237211119. The reversal of 16646237211077 is 77011273264661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11186121728356 + 5460115482721 = 3344566^2 + 2336689^2 .

It is a cyclic number.

It is not a de Polignac number, because 16646237211077 - 2¹⁴ = 16646237194693 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 (16646237211277) 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, 489595212074 + ... + 489595212107.

It is an arithmetic number, because the mean of its divisors is an integer number (4406356908819).

Almost surely, 2^{16646237211077} is an apocalyptic number.

16646237211077 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16646237211077 is a deficient number, since it is larger than the sum of its proper divisors (979190424199).

16646237211077 is an equidigital number, since it uses as much as digits as its factorization.

16646237211077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979190424198.

The product of its (nonzero) digits is 3556224, while the sum is 53.

The spelling of 16646237211077 in words is "sixteen trillion, six hundred forty-six billion, two hundred thirty-seven million, two hundred eleven thousand, seventy-seven".