120671111121557 has 2 divisors, whose sum is σ = 120671111121558. Its totient is φ = 120671111121556.

The previous prime is 120671111121523. The next prime is 120671111121571. The reversal of 120671111121557 is 755121111176021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113027218793476 + 7643892328081 = 10631426^2 + 2764759^2 .

It is a cyclic number.

It is not a de Polignac number, because 120671111121557 - 2⁶ = 120671111121493 is a prime.

It is a super-2 number, since 2×120671111121557² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120671111121157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60335555560778 + 60335555560779.

It is an arithmetic number, because the mean of its divisors is an integer number (60335555560779).

Almost surely, 2^{120671111121557} is an apocalyptic number.

It is an amenable number.

120671111121557 is a deficient number, since it is larger than the sum of its proper divisors (1).

120671111121557 is an equidigital number, since it uses as much as digits as its factorization.

120671111121557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 41.

Adding to 120671111121557 its reverse (755121111176021), we get a palindrome (875792222297578).

The spelling of 120671111121557 in words is "one hundred twenty trillion, six hundred seventy-one billion, one hundred eleven million, one hundred twenty-one thousand, five hundred fifty-seven".