154541551225421 has 4 divisors (see below), whose sum is σ = 154542407264700. Its totient is φ = 154540695186144.

The previous prime is 154541551225339. The next prime is 154541551225459. The reversal of 154541551225421 is 124522155145451.

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 113219410292521 + 41322140932900 = 10640461^2 + 6428230^2 .

It is a cyclic number.

It is not a de Polignac number, because 154541551225421 - 2¹⁸ = 154541550963277 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 (154541551225471) 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, 427748786 + ... + 428109923.

It is an arithmetic number, because the mean of its divisors is an integer number (38635601816175).

Almost surely, 2^{154541551225421} is an apocalyptic number.

It is an amenable number.

154541551225421 is a deficient number, since it is larger than the sum of its proper divisors (856039279).

154541551225421 is an equidigital number, since it uses as much as digits as its factorization.

154541551225421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856039278.

The product of its digits is 1600000, while the sum is 47.

The spelling of 154541551225421 in words is "one hundred fifty-four trillion, five hundred forty-one billion, five hundred fifty-one million, two hundred twenty-five thousand, four hundred twenty-one".