155050402525021 has 2 divisors, whose sum is σ = 155050402525022. Its totient is φ = 155050402525020.

The previous prime is 155050402525001. The next prime is 155050402525049. The reversal of 155050402525021 is 120525204050551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123109254802521 + 31941147722500 = 11095461^2 + 5651650^2 .

It is a cyclic number.

It is not a de Polignac number, because 155050402525021 - 2⁴³ = 146254309502813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155050402525001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77525201262510 + 77525201262511.

It is an arithmetic number, because the mean of its divisors is an integer number (77525201262511).

Almost surely, 2^{155050402525021} is an apocalyptic number.

It is an amenable number.

155050402525021 is a deficient number, since it is larger than the sum of its proper divisors (1).

155050402525021 is an equidigital number, since it uses as much as digits as its factorization.

155050402525021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100000, while the sum is 37.

Adding to 155050402525021 its reverse (120525204050551), we get a palindrome (275575606575572).

The spelling of 155050402525021 in words is "one hundred fifty-five trillion, fifty billion, four hundred two million, five hundred twenty-five thousand, twenty-one".