123420655919 has 4 divisors (see below), whose sum is σ = 134640715560. Its totient is φ = 112200596280.

The previous prime is 123420655907. The next prime is 123420655949. The reversal of 123420655919 is 919556024321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919556024321 = 11 ⋅83596002211.

It is a cyclic number.

It is not a de Polignac number, because 123420655919 - 2⁴ = 123420655903 is a prime.

It is a super-2 number, since 2×123420655919² (a number of 23 digits) contains 22 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 (123420655949) 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, 5610029804 + ... + 5610029825.

It is an arithmetic number, because the mean of its divisors is an integer number (33660178890).

Almost surely, 2^123420655919 is an apocalyptic number.

123420655919 is a deficient number, since it is larger than the sum of its proper divisors (11220059641).

123420655919 is a wasteful number, since it uses less digits than its factorization.

123420655919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11220059640.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 123420655919 in words is "one hundred twenty-three billion, four hundred twenty million, six hundred fifty-five thousand, nine hundred nineteen".