123521366542 has 16 divisors (see below), whose sum is σ = 211793190912. Its totient is φ = 52927159320.

The previous prime is 123521366477. The next prime is 123521366557. The reversal of 123521366542 is 245663125321.

It is a junction number, because it is equal to n+sod(n) for n = 123521366495 and 123521366504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807934 + ... + 948577.

It is an arithmetic number, because the mean of its divisors is an integer number (13237074432).

Almost surely, 2^123521366542 is an apocalyptic number.

123521366542 is a deficient number, since it is larger than the sum of its proper divisors (88271824370).

123521366542 is a wasteful number, since it uses less digits than its factorization.

123521366542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761543.

The product of its digits is 259200, while the sum is 40.

The spelling of 123521366542 in words is "one hundred twenty-three billion, five hundred twenty-one million, three hundred sixty-six thousand, five hundred forty-two".