16635514056461 has 4 divisors (see below), whose sum is σ = 16635964566300. Its totient is φ = 16635063546624.

The previous prime is 16635514056457. The next prime is 16635514056523. The reversal of 16635514056461 is 16465041553661.

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 4178320280836 + 12457193775625 = 2044094^2 + 3529475^2 .

It is a cyclic number.

It is not a de Polignac number, because 16635514056461 - 2² = 16635514056457 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 (16635514056451) 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, 225199526 + ... + 225273383.

It is an arithmetic number, because the mean of its divisors is an integer number (4158991141575).

Almost surely, 2^{16635514056461} is an apocalyptic number.

It is an amenable number.

16635514056461 is a deficient number, since it is larger than the sum of its proper divisors (450509839).

16635514056461 is an equidigital number, since it uses as much as digits as its factorization.

16635514056461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450509838.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 16635514056461 in words is "sixteen trillion, six hundred thirty-five billion, five hundred fourteen million, fifty-six thousand, four hundred sixty-one".