154201032125561 has 4 divisors (see below), whose sum is σ = 158368627588452. Its totient is φ = 150033436662672.

The previous prime is 154201032125557. The next prime is 154201032125579. The reversal of 154201032125561 is 165521230102451.

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 53494669140025 + 100706362985536 = 7314005^2 + 10035256^2 .

It is a cyclic number.

It is not a de Polignac number, because 154201032125561 - 2² = 154201032125557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154201032125761) 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, 2083797731390 + ... + 2083797731463.

It is an arithmetic number, because the mean of its divisors is an integer number (39592156897113).

Almost surely, 2^{154201032125561} is an apocalyptic number.

It is an amenable number.

154201032125561 is a deficient number, since it is larger than the sum of its proper divisors (4167595462891).

154201032125561 is an equidigital number, since it uses as much as digits as its factorization.

154201032125561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167595462890.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 154201032125561 in words is "one hundred fifty-four trillion, two hundred one billion, thirty-two million, one hundred twenty-five thousand, five hundred sixty-one".