16251681406 has 8 divisors (see below), whose sum is σ = 24387716304. Its totient is φ = 8122442640.

The previous prime is 16251681377. The next prime is 16251681409. The reversal of 16251681406 is 60418615261.

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

It is a super-3 number, since 3×16251681406³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16251681409) 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, 1693050 + ... + 1702621.

It is an arithmetic number, because the mean of its divisors is an integer number (3048464538).

Almost surely, 2^16251681406 is an apocalyptic number.

16251681406 is a deficient number, since it is larger than the sum of its proper divisors (8136034898).

16251681406 is a wasteful number, since it uses less digits than its factorization.

16251681406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3398066.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 16251681406 in words is "sixteen billion, two hundred fifty-one million, six hundred eighty-one thousand, four hundred six".