154749691009 has 4 divisors (see below), whose sum is σ = 154767023316. Its totient is φ = 154732358704.

The previous prime is 154749690971. The next prime is 154749691037. The reversal of 154749691009 is 900196947451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900196947451 = 79 ⋅11394898069.

It can be written as a sum of positive squares in 2 ways, for example, as 28900000000 + 125849691009 = 170000^2 + 354753^2 .

It is a cyclic number.

It is not a de Polignac number, because 154749691009 - 2⁹ = 154749690497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154749691099) 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, 8652754 + ... + 8670619.

It is an arithmetic number, because the mean of its divisors is an integer number (38691755829).

Almost surely, 2^154749691009 is an apocalyptic number.

It is an amenable number.

154749691009 is a deficient number, since it is larger than the sum of its proper divisors (17332307).

154749691009 is an equidigital number, since it uses as much as digits as its factorization.

154749691009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17332306.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 154749691009 in words is "one hundred fifty-four billion, seven hundred forty-nine million, six hundred ninety-one thousand, nine".