55312732781 has 2 divisors, whose sum is σ = 55312732782. Its totient is φ = 55312732780.

The previous prime is 55312732757. The next prime is 55312732801. The reversal of 55312732781 is 18723721355.

55312732781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33364310281 + 21948422500 = 182659^2 + 148150^2 .

It is a cyclic number.

It is not a de Polignac number, because 55312732781 - 2¹⁸ = 55312470637 is a prime.

It is a super-2 number, since 2×55312732781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55312732711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27656366390 + 27656366391.

It is an arithmetic number, because the mean of its divisors is an integer number (27656366391).

Almost surely, 2^55312732781 is an apocalyptic number.

It is an amenable number.

55312732781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55312732781 is an equidigital number, since it uses as much as digits as its factorization.

55312732781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 44.

The spelling of 55312732781 in words is "fifty-five billion, three hundred twelve million, seven hundred thirty-two thousand, seven hundred eighty-one".