154345379721 has 16 divisors (see below), whose sum is σ = 221835465600. Its totient is φ = 94891201920.

The previous prime is 154345379719. The next prime is 154345379729. The reversal of 154345379721 is 127973543451.

It is not a de Polignac number, because 154345379721 - 2¹ = 154345379719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (154345379729) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1845445 + ... + 1927266.

It is an arithmetic number, because the mean of its divisors is an integer number (13864716600).

Almost surely, 2^154345379721 is an apocalyptic number.

It is an amenable number.

154345379721 is a deficient number, since it is larger than the sum of its proper divisors (67490085879).

154345379721 is a wasteful number, since it uses less digits than its factorization.

154345379721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773776.

The product of its digits is 3175200, while the sum is 51.

The spelling of 154345379721 in words is "one hundred fifty-four billion, three hundred forty-five million, three hundred seventy-nine thousand, seven hundred twenty-one".