1233523155551 has 4 divisors (see below), whose sum is σ = 1233656044632. Its totient is φ = 1233390266472.

The previous prime is 1233523155539. The next prime is 1233523155563. The reversal of 1233523155551 is 1555513253321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1233523155539) and next prime (1233523155563).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1233523155551 is a prime.

It is a super-2 number, since 2×1233523155551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1233523155499 and 1233523155508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233523158551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66430616 + ... + 66449181.

It is an arithmetic number, because the mean of its divisors is an integer number (308414011158).

Almost surely, 2^{1233523155551} is an apocalyptic number.

1233523155551 is a deficient number, since it is larger than the sum of its proper divisors (132889081).

1233523155551 is an equidigital number, since it uses as much as digits as its factorization.

1233523155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132889080.

The product of its digits is 337500, while the sum is 41.

The spelling of 1233523155551 in words is "one trillion, two hundred thirty-three billion, five hundred twenty-three million, one hundred fifty-five thousand, five hundred fifty-one".