61681282933781 has 16 divisors (see below), whose sum is σ = 73314539927040. Its totient is φ = 50789612165760.

The previous prime is 61681282933771. The next prime is 61681282933783. The reversal of 61681282933781 is 18733928218616.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61681282933781 is a prime.

It is a super-2 number, since 2×61681282933781² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61681282933783) 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, 1507268600 + ... + 1507309521.

It is an arithmetic number, because the mean of its divisors is an integer number (4582158745440).

Almost surely, 2^{61681282933781} is an apocalyptic number.

It is an amenable number.

61681282933781 is a deficient number, since it is larger than the sum of its proper divisors (11633256993259).

61681282933781 is a wasteful number, since it uses less digits than its factorization.

61681282933781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014578244.

The product of its digits is 41803776, while the sum is 65.

The spelling of 61681282933781 in words is "sixty-one trillion, six hundred eighty-one billion, two hundred eighty-two million, nine hundred thirty-three thousand, seven hundred eighty-one".