158272785521 has 2 divisors, whose sum is σ = 158272785522. Its totient is φ = 158272785520.

The previous prime is 158272785509. The next prime is 158272785547. The reversal of 158272785521 is 125587272851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154342122496 + 3930663025 = 392864^2 + 62695^2 .

It is an emirp because it is prime and its reverse (125587272851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158272785521 is a prime.

It is not a weakly prime, because it can be changed into another prime (158272785581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79136392760 + 79136392761.

It is an arithmetic number, because the mean of its divisors is an integer number (79136392761).

Almost surely, 2^158272785521 is an apocalyptic number.

It is an amenable number.

158272785521 is a deficient number, since it is larger than the sum of its proper divisors (1).

158272785521 is an equidigital number, since it uses as much as digits as its factorization.

158272785521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136000, while the sum is 53.

The spelling of 158272785521 in words is "one hundred fifty-eight billion, two hundred seventy-two million, seven hundred eighty-five thousand, five hundred twenty-one".