16440420125 has 16 divisors (see below), whose sum is σ = 21409719552. Its totient is φ = 12580493200.

The previous prime is 16440420121. The next prime is 16440420127. The reversal of 16440420125 is 52102404461.

It is not a de Polignac number, because 16440420125 - 2² = 16440420121 is a prime.

It is a super-3 number, since 3×16440420125³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440420121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2856329 + ... + 2862078.

It is an arithmetic number, because the mean of its divisors is an integer number (1338107472).

Almost surely, 2^16440420125 is an apocalyptic number.

It is an amenable number.

16440420125 is a deficient number, since it is larger than the sum of its proper divisors (4969299427).

16440420125 is an equidigital number, since it uses as much as digits as its factorization.

16440420125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718445 (or 5718435 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 16440420125 its reverse (52102404461), we get a palindrome (68542824586).

The spelling of 16440420125 in words is "sixteen billion, four hundred forty million, four hundred twenty thousand, one hundred twenty-five".