61758228138 has 16 divisors (see below), whose sum is σ = 126144466560. Its totient is φ = 20148074336.

The previous prime is 61758228113. The next prime is 61758228139. The reversal of 61758228138 is 83182285716.

It is not an unprimeable number, because it can be changed into a prime (61758228139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109500123 + ... + 109500686.

It is an arithmetic number, because the mean of its divisors is an integer number (7884029160).

Almost surely, 2^61758228138 is an apocalyptic number.

61758228138 is an abundant number, since it is smaller than the sum of its proper divisors (64386238422).

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

61758228138 is a wasteful number, since it uses less digits than its factorization.

61758228138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219000861.

The product of its digits is 1290240, while the sum is 51.

The spelling of 61758228138 in words is "sixty-one billion, seven hundred fifty-eight million, two hundred twenty-eight thousand, one hundred thirty-eight".