55115111501 has 2 divisors, whose sum is σ = 55115111502. Its totient is φ = 55115111500.

The previous prime is 55115111453. The next prime is 55115111521. The reversal of 55115111501 is 10511151155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54896958601 + 218152900 = 234301^2 + 14770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55115111501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55115111521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27557555750 + 27557555751.

It is an arithmetic number, because the mean of its divisors is an integer number (27557555751).

Almost surely, 2^55115111501 is an apocalyptic number.

It is an amenable number.

55115111501 is a deficient number, since it is larger than the sum of its proper divisors (1).

55115111501 is an equidigital number, since it uses as much as digits as its factorization.

55115111501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625, while the sum is 26.

Adding to 55115111501 its reverse (10511151155), we get a palindrome (65626262656).

The spelling of 55115111501 in words is "fifty-five billion, one hundred fifteen million, one hundred eleven thousand, five hundred one".