55536221731 has 2 divisors, whose sum is σ = 55536221732. Its totient is φ = 55536221730.

The previous prime is 55536221729. The next prime is 55536221737. The reversal of 55536221731 is 13712263555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55536221731 - 2¹ = 55536221729 is a prime.

It is a super-2 number, since 2×55536221731² (a number of 22 digits) contains 22 as substring.

Together with 55536221729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55536221737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27768110865 + 27768110866.

It is an arithmetic number, because the mean of its divisors is an integer number (27768110866).

Almost surely, 2^55536221731 is an apocalyptic number.

55536221731 is a deficient number, since it is larger than the sum of its proper divisors (1).

55536221731 is an equidigital number, since it uses as much as digits as its factorization.

55536221731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 40.

The spelling of 55536221731 in words is "fifty-five billion, five hundred thirty-six million, two hundred twenty-one thousand, seven hundred thirty-one".