154520425561 has 2 divisors, whose sum is σ = 154520425562. Its totient is φ = 154520425560.

The previous prime is 154520425489. The next prime is 154520425643. The reversal of 154520425561 is 165524025451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97718760000 + 56801665561 = 312600^2 + 238331^2 .

It is a cyclic number.

It is not a de Polignac number, because 154520425561 - 2²³ = 154512036953 is a prime.

It is not a weakly prime, because it can be changed into another prime (154520425361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77260212780 + 77260212781.

It is an arithmetic number, because the mean of its divisors is an integer number (77260212781).

Almost surely, 2^154520425561 is an apocalyptic number.

It is an amenable number.

154520425561 is a deficient number, since it is larger than the sum of its proper divisors (1).

154520425561 is an equidigital number, since it uses as much as digits as its factorization.

154520425561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 154520425561 in words is "one hundred fifty-four billion, five hundred twenty million, four hundred twenty-five thousand, five hundred sixty-one".