123205401551 has 4 divisors (see below), whose sum is σ = 123217877832. Its totient is φ = 123192925272.

The previous prime is 123205401533. The next prime is 123205401569. The reversal of 123205401551 is 155104502321.

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 (123205401533) and next prime (123205401569).

It is a cyclic number.

It is not a de Polignac number, because 123205401551 - 2¹⁴ = 123205385167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123205431551) 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, 6223316 + ... + 6243081.

It is an arithmetic number, because the mean of its divisors is an integer number (30804469458).

Almost surely, 2^123205401551 is an apocalyptic number.

123205401551 is a deficient number, since it is larger than the sum of its proper divisors (12476281).

123205401551 is an equidigital number, since it uses as much as digits as its factorization.

123205401551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12476280.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 123205401551 its reverse (155104502321), we get a palindrome (278309903872).

The spelling of 123205401551 in words is "one hundred twenty-three billion, two hundred five million, four hundred one thousand, five hundred fifty-one".