16665625401 has 16 divisors (see below), whose sum is σ = 23394484800. Its totient is φ = 10523798208.

The previous prime is 16665625399. The next prime is 16665625409. The reversal of 16665625401 is 10452656661.

16665625401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16665625401 - 2¹ = 16665625399 is a prime.

It is a super-3 number, since 3×16665625401³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16665625409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346135 + ... + 391331.

It is an arithmetic number, because the mean of its divisors is an integer number (1462155300).

Almost surely, 2^16665625401 is an apocalyptic number.

It is an amenable number.

16665625401 is a deficient number, since it is larger than the sum of its proper divisors (6728859399).

16665625401 is a wasteful number, since it uses less digits than its factorization.

16665625401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51688.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 16665625401 in words is "sixteen billion, six hundred sixty-five million, six hundred twenty-five thousand, four hundred one".