61980558642 has 20 divisors (see below), whose sum is σ = 138882363246. Its totient is φ = 20660186160.

The previous prime is 61980558641. The next prime is 61980558643. The reversal of 61980558642 is 24685508916.

61980558642 is a `hidden beast` number, since 6 + 1 + 9 + 80 + 558 + 6 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (61980558641) and next prime (61980558643).

It can be written as a sum of positive squares in only one way, i.e., 40929740721 + 21050817921 = 202311^2 + 145089^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (61980558641) 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 9 ways as a sum of consecutive naturals, for example, 191297859 + ... + 191298182.

Almost surely, 2^61980558642 is an apocalyptic number.

61980558642 is an abundant number, since it is smaller than the sum of its proper divisors (76901804604).

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

61980558642 is a wasteful number, since it uses less digits than its factorization.

61980558642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382596055 (or 382596046 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 61980558642 in words is "sixty-one billion, nine hundred eighty million, five hundred fifty-eight thousand, six hundred forty-two".