61442740188 has 60 divisors (see below), whose sum is σ = 160759109280. Its totient is φ = 20463617088.

The previous prime is 61442740157. The next prime is 61442740199. The reversal of 61442740188 is 88104724416.

61442740188 is a `hidden beast` number, since 6 + 1 + 4 + 427 + 40 + 188 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 307053 + ... + 466011.

It is an arithmetic number, because the mean of its divisors is an integer number (2679318488).

Almost surely, 2^61442740188 is an apocalyptic number.

It is an amenable number.

61442740188 is an abundant number, since it is smaller than the sum of its proper divisors (99316369092).

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

61442740188 is a wasteful number, since it uses less digits than its factorization.

61442740188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160168 (or 160157 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 61442740188 in words is "sixty-one billion, four hundred forty-two million, seven hundred forty thousand, one hundred eighty-eight".