155425590121 has 2 divisors, whose sum is σ = 155425590122. Its totient is φ = 155425590120.

The previous prime is 155425590083. The next prime is 155425590143. The reversal of 155425590121 is 121095524551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123597246096 + 31828344025 = 351564^2 + 178405^2 .

It is a cyclic number.

It is not a de Polignac number, because 155425590121 - 2⁹ = 155425589609 is a prime.

It is a super-2 number, since 2×155425590121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155423590121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77712795060 + 77712795061.

It is an arithmetic number, because the mean of its divisors is an integer number (77712795061).

Almost surely, 2^155425590121 is an apocalyptic number.

It is an amenable number.

155425590121 is a deficient number, since it is larger than the sum of its proper divisors (1).

155425590121 is an equidigital number, since it uses as much as digits as its factorization.

155425590121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90000, while the sum is 40.

The spelling of 155425590121 in words is "one hundred fifty-five billion, four hundred twenty-five million, five hundred ninety thousand, one hundred twenty-one".