16147661 has 4 divisors (see below), whose sum is σ = 16523232. Its totient is φ = 15772092.

The previous prime is 16147657. The next prime is 16147699. The reversal of 16147661 is 16674161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16147661 - 2² = 16147657 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 (16147561) 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, 187721 + ... + 187806.

It is an arithmetic number, because the mean of its divisors is an integer number (4130808).

Almost surely, 2^16147661 is an apocalyptic number.

It is an amenable number.

16147661 is a deficient number, since it is larger than the sum of its proper divisors (375571).

16147661 is an equidigital number, since it uses as much as digits as its factorization.

16147661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375570.

The product of its digits is 6048, while the sum is 32.

The square root of 16147661 is about 4018.4152348905. The cubic root of 16147661 is about 252.7570091682.

The spelling of 16147661 in words is "sixteen million, one hundred forty-seven thousand, six hundred sixty-one".