154040641561 has 2 divisors, whose sum is σ = 154040641562. Its totient is φ = 154040641560.

The previous prime is 154040641507. The next prime is 154040641597. The reversal of 154040641561 is 165146040451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153962849161 + 77792400 = 392381^2 + 8820^2 .

It is a cyclic number.

It is not a de Polignac number, because 154040641561 - 2⁹ = 154040641049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154040641561.

It is not a weakly prime, because it can be changed into another prime (154040641361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77020320780 + 77020320781.

It is an arithmetic number, because the mean of its divisors is an integer number (77020320781).

Almost surely, 2^154040641561 is an apocalyptic number.

It is an amenable number.

154040641561 is a deficient number, since it is larger than the sum of its proper divisors (1).

154040641561 is an equidigital number, since it uses as much as digits as its factorization.

154040641561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 37.

It can be divided in two parts, 15404064 and 1561, that added together give a square (15405625 = 3925²).

The spelling of 154040641561 in words is "one hundred fifty-four billion, forty million, six hundred forty-one thousand, five hundred sixty-one".