16616400660434 has 4 divisors (see below), whose sum is σ = 24924600990654. Its totient is φ = 8308200330216.

The previous prime is 16616400660407. The next prime is 16616400660437. The reversal of 16616400660434 is 43406600461661.

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 only one way, i.e., 13419803523025 + 3196597137409 = 3663305^2 + 1787903^2 .

It is a super-2 number, since 2×16616400660434² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16616400660437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4154100165107 + ... + 4154100165110.

Almost surely, 2^{16616400660434} is an apocalyptic number.

16616400660434 is a deficient number, since it is larger than the sum of its proper divisors (8308200330220).

16616400660434 is an equidigital number, since it uses as much as digits as its factorization.

16616400660434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8308200330219.

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 16616400660434 in words is "sixteen trillion, six hundred sixteen billion, four hundred million, six hundred sixty thousand, four hundred thirty-four".