123536561372 has 48 divisors (see below), whose sum is σ = 252382169088. Its totient is φ = 51807054720.

The previous prime is 123536561363. The next prime is 123536561587. The reversal of 123536561372 is 273165635321.

It is a happy number.

It is a super-2 number, since 2×123536561372² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12050753 + ... + 12060999.

It is an arithmetic number, because the mean of its divisors is an integer number (5257961856).

Almost surely, 2^123536561372 is an apocalyptic number.

It is an amenable number.

123536561372 is an abundant number, since it is smaller than the sum of its proper divisors (128845607716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123536561372 is a wasteful number, since it uses less digits than its factorization.

123536561372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19466 (or 19464 counting only the distinct ones).

The product of its digits is 680400, while the sum is 44.

The spelling of 123536561372 in words is "one hundred twenty-three billion, five hundred thirty-six million, five hundred sixty-one thousand, three hundred seventy-two".