66154401406 has 16 divisors (see below), whose sum is σ = 103551480864. Its totient is φ = 31637392864.

The previous prime is 66154401377. The next prime is 66154401427. The reversal of 66154401406 is 60410445166.

It is a congruent number.

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, 1706616 + ... + 1744948.

It is an arithmetic number, because the mean of its divisors is an integer number (6471967554).

Almost surely, 2^66154401406 is an apocalyptic number.

66154401406 is a deficient number, since it is larger than the sum of its proper divisors (37397079458).

66154401406 is a wasteful number, since it uses less digits than its factorization.

66154401406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75875.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 66154401406 in words is "sixty-six billion, one hundred fifty-four million, four hundred one thousand, four hundred six".