55215644515513 has 2 divisors, whose sum is σ = 55215644515514. Its totient is φ = 55215644515512.

The previous prime is 55215644515333. The next prime is 55215644515517. The reversal of 55215644515513 is 31551544651255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37894957068544 + 17320687446969 = 6155888^2 + 4161813^2 .

It is a cyclic number.

It is not a de Polignac number, because 55215644515513 - 2²⁹ = 55215107644601 is a prime.

It is not a weakly prime, because it can be changed into another prime (55215644515517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27607822257756 + 27607822257757.

It is an arithmetic number, because the mean of its divisors is an integer number (27607822257757).

Almost surely, 2^{55215644515513} is an apocalyptic number.

It is an amenable number.

55215644515513 is a deficient number, since it is larger than the sum of its proper divisors (1).

55215644515513 is an equidigital number, since it uses as much as digits as its factorization.

55215644515513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000000, while the sum is 52.

The spelling of 55215644515513 in words is "fifty-five trillion, two hundred fifteen billion, six hundred forty-four million, five hundred fifteen thousand, five hundred thirteen".