61381934973 has 16 divisors (see below), whose sum is σ = 91326493440. Its totient is φ = 40745657952.

The previous prime is 61381934951. The next prime is 61381934987. The reversal of 61381934973 is 37943918316.

It is a happy number.

61381934973 is a `hidden beast` number, since 6 + 138 + 19 + 3 + 497 + 3 = 666.

It is not a de Polignac number, because 61381934973 - 2⁶ = 61381934909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381934923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4872261 + ... + 4884842.

It is an arithmetic number, because the mean of its divisors is an integer number (5707905840).

Almost surely, 2^61381934973 is an apocalyptic number.

It is an amenable number.

61381934973 is a deficient number, since it is larger than the sum of its proper divisors (29944558467).

61381934973 is a wasteful number, since it uses less digits than its factorization.

61381934973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9757345 (or 9757339 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The spelling of 61381934973 in words is "sixty-one billion, three hundred eighty-one million, nine hundred thirty-four thousand, nine hundred seventy-three".