123506006656 has 16 divisors (see below), whose sum is σ = 246047122890. Its totient is φ = 61753003264.

The previous prime is 123506006653. The next prime is 123506006683. The reversal of 123506006656 is 656600605321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 89870446656 + 33635560000 = 299784^2 + 183400^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×123506006656² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123506006653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482445211 + ... + 482445466.

Almost surely, 2^123506006656 is an apocalyptic number.

123506006656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123506006656 is a deficient number, since it is larger than the sum of its proper divisors (122541116234).

123506006656 is an frugal number, since it uses more digits than its factorization.

123506006656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964890691 (or 964890679 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 123506006656 in words is "one hundred twenty-three billion, five hundred six million, six thousand, six hundred fifty-six".