155546306561 has 2 divisors, whose sum is σ = 155546306562. Its totient is φ = 155546306560.

The previous prime is 155546306551. The next prime is 155546306599. The reversal of 155546306561 is 165603645551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152787956161 + 2758350400 = 390881^2 + 52520^2 .

It is a cyclic number.

It is not a de Polignac number, because 155546306561 - 2¹⁴ = 155546290177 is a prime.

It is not a weakly prime, because it can be changed into another prime (155546306551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77773153280 + 77773153281.

It is an arithmetic number, because the mean of its divisors is an integer number (77773153281).

Almost surely, 2^155546306561 is an apocalyptic number.

It is an amenable number.

155546306561 is a deficient number, since it is larger than the sum of its proper divisors (1).

155546306561 is an equidigital number, since it uses as much as digits as its factorization.

155546306561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 155546306561 in words is "one hundred fifty-five billion, five hundred forty-six million, three hundred six thousand, five hundred sixty-one".