661213539348 has 24 divisors (see below), whose sum is σ = 1545533589600. Its totient is φ = 220018513440.

The previous prime is 661213539347. The next prime is 661213539367. The reversal of 661213539348 is 843935312166.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 661213539348.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661213539347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48242823 + ... + 48256526.

It is an arithmetic number, because the mean of its divisors is an integer number (64397232900).

Almost surely, 2^661213539348 is an apocalyptic number.

It is an amenable number.

661213539348 is an abundant number, since it is smaller than the sum of its proper divisors (884320050252).

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

661213539348 is a wasteful number, since it uses less digits than its factorization.

661213539348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96499927 (or 96499925 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The spelling of 661213539348 in words is "six hundred sixty-one billion, two hundred thirteen million, five hundred thirty-nine thousand, three hundred forty-eight".