154553156561 has 4 divisors (see below), whose sum is σ = 154733499492. Its totient is φ = 154372813632.

The previous prime is 154553156507. The next prime is 154553156579. The reversal of 154553156561 is 165651355451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80517467536 + 74035689025 = 283756^2 + 272095^2 .

It is a cyclic number.

It is not a de Polignac number, because 154553156561 - 2²² = 154548962257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154553156581) 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, 90170180 + ... + 90171893.

It is an arithmetic number, because the mean of its divisors is an integer number (38683374873).

Almost surely, 2^154553156561 is an apocalyptic number.

It is an amenable number.

154553156561 is a deficient number, since it is larger than the sum of its proper divisors (180342931).

154553156561 is an equidigital number, since it uses as much as digits as its factorization.

154553156561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180342930.

The product of its digits is 1350000, while the sum is 47.

The spelling of 154553156561 in words is "one hundred fifty-four billion, five hundred fifty-three million, one hundred fifty-six thousand, five hundred sixty-one".