16451372406666 has 16 divisors (see below), whose sum is σ = 34634468224800. Its totient is φ = 5195170233648.

The previous prime is 16451372406653. The next prime is 16451372406731. The reversal of 16451372406666 is 66660427315461.

It is a happy number.

It is a super-2 number, since 2×16451372406666² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72155142021 + ... + 72155142248.

It is an arithmetic number, because the mean of its divisors is an integer number (2164654264050).

Almost surely, 2^{16451372406666} is an apocalyptic number.

16451372406666 is an abundant number, since it is smaller than the sum of its proper divisors (18183095818134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16451372406666 is a wasteful number, since it uses less digits than its factorization.

16451372406666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144310284293.

The product of its (nonzero) digits is 26127360, while the sum is 57.

The spelling of 16451372406666 in words is "sixteen trillion, four hundred fifty-one billion, three hundred seventy-two million, four hundred six thousand, six hundred sixty-six".