661250123534 has 96 divisors (see below), whose sum is σ = 1345058749440. Its totient is φ = 237241350720.

The previous prime is 661250123447. The next prime is 661250123537. The reversal of 661250123534 is 435321052166.

661250123534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661250123537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9191387 + ... + 9263049.

It is an arithmetic number, because the mean of its divisors is an integer number (14011028640).

Almost surely, 2^661250123534 is an apocalyptic number.

661250123534 is an abundant number, since it is smaller than the sum of its proper divisors (683808625906).

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

661250123534 is a wasteful number, since it uses less digits than its factorization.

661250123534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72126 (or 72115 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 661250123534 in words is "six hundred sixty-one billion, two hundred fifty million, one hundred twenty-three thousand, five hundred thirty-four".