123536536451 has 2 divisors, whose sum is σ = 123536536452. Its totient is φ = 123536536450.

The previous prime is 123536536441. The next prime is 123536536463. The reversal of 123536536451 is 154635635321.

It is a weak prime.

It is an emirp because it is prime and its reverse (154635635321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123536536451 - 2¹⁸ = 123536274307 is a prime.

It is a super-2 number, since 2×123536536451² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123536536421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61768268225 + 61768268226.

It is an arithmetic number, because the mean of its divisors is an integer number (61768268226).

Almost surely, 2^123536536451 is an apocalyptic number.

123536536451 is a deficient number, since it is larger than the sum of its proper divisors (1).

123536536451 is an equidigital number, since it uses as much as digits as its factorization.

123536536451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 44.

The spelling of 123536536451 in words is "one hundred twenty-three billion, five hundred thirty-six million, five hundred thirty-six thousand, four hundred fifty-one".