123500617945 has 4 divisors (see below), whose sum is σ = 148200741540. Its totient is φ = 98800494352.

The previous prime is 123500617939. The next prime is 123500617949. The reversal of 123500617945 is 549716005321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25137468304 + 98363149641 = 158548^2 + 313629^2 .

It is a cyclic number.

It is not a de Polignac number, because 123500617945 - 2¹⁹ = 123500093657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123500617949) 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, 12350061790 + ... + 12350061799.

It is an arithmetic number, because the mean of its divisors is an integer number (37050185385).

Almost surely, 2^123500617945 is an apocalyptic number.

It is an amenable number.

123500617945 is a deficient number, since it is larger than the sum of its proper divisors (24700123595).

123500617945 is an equidigital number, since it uses as much as digits as its factorization.

123500617945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24700123594.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 123500617945 in words is "one hundred twenty-three billion, five hundred million, six hundred seventeen thousand, nine hundred forty-five".