16161467921 has 8 divisors (see below), whose sum is σ = 16486502184. Its totient is φ = 15837178240.

The previous prime is 16161467909. The next prime is 16161467929. The reversal of 16161467921 is 12976416161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3384330625 + 12777137296 = 58175^2 + 113036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16161467921 - 2²² = 16157273617 is a prime.

It is a super-2 number, since 2×16161467921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16161467929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142196 + ... + 229221.

It is an arithmetic number, because the mean of its divisors is an integer number (2060812773).

Almost surely, 2^16161467921 is an apocalyptic number.

It is an amenable number.

16161467921 is a deficient number, since it is larger than the sum of its proper divisors (325034263).

16161467921 is an equidigital number, since it uses as much as digits as its factorization.

16161467921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372291.

The product of its digits is 108864, while the sum is 44.

The spelling of 16161467921 in words is "sixteen billion, one hundred sixty-one million, four hundred sixty-seven thousand, nine hundred twenty-one".