154981399789 has 4 divisors (see below), whose sum is σ = 155317585500. Its totient is φ = 154645214080.

The previous prime is 154981399753. The next prime is 154981399847. The reversal of 154981399789 is 987993189451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987993189451 = 11171 ⋅88442681.

It can be written as a sum of positive squares in 2 ways, for example, as 57585600900 + 97395798889 = 239970^2 + 312083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154981399789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154981399739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168092164 + ... + 168093085.

It is an arithmetic number, because the mean of its divisors is an integer number (38829396375).

Almost surely, 2^154981399789 is an apocalyptic number.

It is an amenable number.

154981399789 is a deficient number, since it is larger than the sum of its proper divisors (336185711).

154981399789 is an equidigital number, since it uses as much as digits as its factorization.

154981399789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336185710.

The product of its digits is 176359680, while the sum is 73.

The spelling of 154981399789 in words is "one hundred fifty-four billion, nine hundred eighty-one million, three hundred ninety-nine thousand, seven hundred eighty-nine".