27777523155623 has 2 divisors, whose sum is σ = 27777523155624. Its totient is φ = 27777523155622.

The previous prime is 27777523155617. The next prime is 27777523155647. The reversal of 27777523155623 is 32655132577772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27777523155623 - 2¹² = 27777523151527 is a prime.

It is a super-2 number, since 2×27777523155623² (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 (27777523155223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888761577811 + 13888761577812.

It is an arithmetic number, because the mean of its divisors is an integer number (13888761577812).

Almost surely, 2^{27777523155623} is an apocalyptic number.

27777523155623 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777523155623 is an equidigital number, since it uses as much as digits as its factorization.

27777523155623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129654000, while the sum is 62.

The spelling of 27777523155623 in words is "twenty-seven trillion, seven hundred seventy-seven billion, five hundred twenty-three million, one hundred fifty-five thousand, six hundred twenty-three".