154878972981 has 8 divisors (see below), whose sum is σ = 208399841760. Its totient is φ = 102305376432.

The previous prime is 154878972979. The next prime is 154878973033. The reversal of 154878972981 is 189279878451.

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

It is not a de Polignac number, because 154878972981 - 2¹ = 154878972979 is a prime.

It is a super-2 number, since 2×154878972981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154878972881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236817675 + ... + 236818328.

It is an arithmetic number, because the mean of its divisors is an integer number (26049980220).

Almost surely, 2^154878972981 is an apocalyptic number.

It is an amenable number.

154878972981 is a deficient number, since it is larger than the sum of its proper divisors (53520868779).

154878972981 is a wasteful number, since it uses less digits than its factorization.

154878972981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473636115.

The product of its digits is 81285120, while the sum is 69.

The spelling of 154878972981 in words is "one hundred fifty-four billion, eight hundred seventy-eight million, nine hundred seventy-two thousand, nine hundred eighty-one".