157999553 has 2 divisors, whose sum is σ = 157999554. Its totient is φ = 157999552.

The previous prime is 157999481. The next prime is 157999559. The reversal of 157999553 is 355999751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117765904 + 40233649 = 10852^2 + 6343^2 .

It is a cyclic number.

It is not a de Polignac number, because 157999553 - 2¹² = 157995457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157999495 and 157999504.

It is not a weakly prime, because it can be changed into another prime (157999559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78999776 + 78999777.

It is an arithmetic number, because the mean of its divisors is an integer number (78999777).

Almost surely, 2^157999553 is an apocalyptic number.

It is an amenable number.

157999553 is a deficient number, since it is larger than the sum of its proper divisors (1).

157999553 is an equidigital number, since it uses as much as digits as its factorization.

157999553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1913625, while the sum is 53.

The square root of 157999553 is about 12569.7873092587. The cubic root of 157999553 is about 540.6115077569.

It can be divided in two parts, 15799 and 9553, that added together give a palindrome (25352).

The spelling of 157999553 in words is "one hundred fifty-seven million, nine hundred ninety-nine thousand, five hundred fifty-three".