123072420755 has 4 divisors (see below), whose sum is σ = 147686904912. Its totient is φ = 98457936600.

The previous prime is 123072420739. The next prime is 123072420769. The reversal of 123072420755 is 557024270321.

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

It is not a de Polignac number, because 123072420755 - 2⁴ = 123072420739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12307242071 + ... + 12307242080.

It is an arithmetic number, because the mean of its divisors is an integer number (36921726228).

Almost surely, 2^123072420755 is an apocalyptic number.

123072420755 is a deficient number, since it is larger than the sum of its proper divisors (24614484157).

123072420755 is an equidigital number, since it uses as much as digits as its factorization.

123072420755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24614484156.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 123072420755 in words is "one hundred twenty-three billion, seventy-two million, four hundred twenty thousand, seven hundred fifty-five".