123216634501 has 4 divisors (see below), whose sum is σ = 123243407872. Its totient is φ = 123189861132.

The previous prime is 123216634493. The next prime is 123216634591. The reversal of 123216634501 is 105436612321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105436612321 = 20021 ⋅5266301.

It is a cyclic number.

It is not a de Polignac number, because 123216634501 - 2³ = 123216634493 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 (123216634591) 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, 13379781 + ... + 13388986.

It is an arithmetic number, because the mean of its divisors is an integer number (30810851968).

Almost surely, 2^123216634501 is an apocalyptic number.

It is an amenable number.

123216634501 is a deficient number, since it is larger than the sum of its proper divisors (26773371).

123216634501 is an equidigital number, since it uses as much as digits as its factorization.

123216634501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26773370.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 123216634501 in words is "one hundred twenty-three billion, two hundred sixteen million, six hundred thirty-four thousand, five hundred one".