154013621666 has 4 divisors (see below), whose sum is σ = 231020432502. Its totient is φ = 77006810832.

The previous prime is 154013621639. The next prime is 154013621681. The reversal of 154013621666 is 666126310451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 150560296441 + 3453325225 = 388021^2 + 58765^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38503405415 + ... + 38503405418.

Almost surely, 2^154013621666 is an apocalyptic number.

154013621666 is a deficient number, since it is larger than the sum of its proper divisors (77006810836).

154013621666 is an equidigital number, since it uses as much as digits as its factorization.

154013621666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77006810835.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 154013621666 in words is "one hundred fifty-four billion, thirteen million, six hundred twenty-one thousand, six hundred sixty-six".