611691138500 has 48 divisors (see below), whose sum is σ = 1438697573040. Its totient is φ = 225855187200.

The previous prime is 611691138469. The next prime is 611691138517. The reversal of 611691138500 is 5831196116.

It can be written as a sum of positive squares in 8 ways, for example, as 423772356484 + 187918782016 = 650978^2 + 433496^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47046665 + ... + 47059664.

It is an arithmetic number, because the mean of its divisors is an integer number (29972866105).

Almost surely, 2^611691138500 is an apocalyptic number.

It is an amenable number.

611691138500 is an abundant number, since it is smaller than the sum of its proper divisors (827006434540).

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

611691138500 is a wasteful number, since it uses less digits than its factorization.

611691138500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94106361 (or 94106349 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 611691138500 in words is "six hundred eleven billion, six hundred ninety-one million, one hundred thirty-eight thousand, five hundred".