154891972865 has 8 divisors (see below), whose sum is σ = 212423277120. Its totient is φ = 106211638512.

The previous prime is 154891972861. The next prime is 154891972871. The reversal of 154891972865 is 568279198451.

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

It is not a de Polignac number, because 154891972865 - 2² = 154891972861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (154891972861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2212742435 + ... + 2212742504.

It is an arithmetic number, because the mean of its divisors is an integer number (26552909640).

Almost surely, 2^154891972865 is an apocalyptic number.

It is an amenable number.

154891972865 is a deficient number, since it is larger than the sum of its proper divisors (57531304255).

154891972865 is an equidigital number, since it uses as much as digits as its factorization.

154891972865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425484951.

The product of its digits is 43545600, while the sum is 65.

The spelling of 154891972865 in words is "one hundred fifty-four billion, eight hundred ninety-one million, nine hundred seventy-two thousand, eight hundred sixty-five".