1233420543551 has 4 divisors (see below), whose sum is σ = 1409623478352. Its totient is φ = 1057217608752.

The previous prime is 1233420543533. The next prime is 1233420543569. The reversal of 1233420543551 is 1553450243321.

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 (1233420543533) and next prime (1233420543569).

It is a cyclic number.

It is not a de Polignac number, because 1233420543551 - 2¹⁸ = 1233420281407 is a prime.

It is a super-3 number, since 3×1233420543551³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233420573551) 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, 88101467390 + ... + 88101467403.

It is an arithmetic number, because the mean of its divisors is an integer number (352405869588).

Almost surely, 2^{1233420543551} is an apocalyptic number.

1233420543551 is a deficient number, since it is larger than the sum of its proper divisors (176202934801).

1233420543551 is an equidigital number, since it uses as much as digits as its factorization.

1233420543551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176202934800.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 1233420543551 its reverse (1553450243321), we get a palindrome (2786870786872).

The spelling of 1233420543551 in words is "one trillion, two hundred thirty-three billion, four hundred twenty million, five hundred forty-three thousand, five hundred fifty-one".