123945055739 has 4 divisors (see below), whose sum is σ = 123949105680. Its totient is φ = 123941005800.

The previous prime is 123945055733. The next prime is 123945055747. The reversal of 123945055739 is 937550549321.

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

It is a cyclic number.

It is not a de Polignac number, because 123945055739 - 2⁴ = 123945055723 is a prime.

It is a super-2 number, since 2×123945055739² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123945055733) 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, 1978712 + ... + 2040389.

It is an arithmetic number, because the mean of its divisors is an integer number (30987276420).

Almost surely, 2^123945055739 is an apocalyptic number.

123945055739 is a deficient number, since it is larger than the sum of its proper divisors (4049941).

123945055739 is an equidigital number, since it uses as much as digits as its factorization.

123945055739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049940.

The product of its (nonzero) digits is 5103000, while the sum is 53.

The spelling of 123945055739 in words is "one hundred twenty-three billion, nine hundred forty-five million, fifty-five thousand, seven hundred thirty-nine".