155980074821 has 2 divisors, whose sum is σ = 155980074822. Its totient is φ = 155980074820.

The previous prime is 155980074793. The next prime is 155980074841. The reversal of 155980074821 is 128470089551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153048393796 + 2931681025 = 391214^2 + 54145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155980074821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155980074821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155980074841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77990037410 + 77990037411.

It is an arithmetic number, because the mean of its divisors is an integer number (77990037411).

Almost surely, 2^155980074821 is an apocalyptic number.

It is an amenable number.

155980074821 is a deficient number, since it is larger than the sum of its proper divisors (1).

155980074821 is an equidigital number, since it uses as much as digits as its factorization.

155980074821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 155980074821 in words is "one hundred fifty-five billion, nine hundred eighty million, seventy-four thousand, eight hundred twenty-one".