55531655715869 has 2 divisors, whose sum is σ = 55531655715870. Its totient is φ = 55531655715868.

The previous prime is 55531655715847. The next prime is 55531655716007. The reversal of 55531655715869 is 96851755613555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48946632538969 + 6585023176900 = 6996187^2 + 2566130^2 .

It is a cyclic number.

It is not a de Polignac number, because 55531655715869 - 2¹² = 55531655711773 is a prime.

It is a super-2 number, since 2×55531655715869² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55531655715829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765827857934 + 27765827857935.

It is an arithmetic number, because the mean of its divisors is an integer number (27765827857935).

Almost surely, 2^{55531655715869} is an apocalyptic number.

It is an amenable number.

55531655715869 is a deficient number, since it is larger than the sum of its proper divisors (1).

55531655715869 is an equidigital number, since it uses as much as digits as its factorization.

55531655715869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500000, while the sum is 71.

The spelling of 55531655715869 in words is "fifty-five trillion, five hundred thirty-one billion, six hundred fifty-five million, seven hundred fifteen thousand, eight hundred sixty-nine".