61711351681 has 8 divisors (see below), whose sum is σ = 73593661824. Its totient is φ = 50595642240.

The previous prime is 61711351661. The next prime is 61711351693. The reversal of 61711351681 is 18615311716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61711351681 - 2¹⁵ = 61711318913 is a prime.

It is a super-2 number, since 2×61711351681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61711351621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191650000 + ... + 191650321.

It is an arithmetic number, because the mean of its divisors is an integer number (9199207728).

Almost surely, 2^61711351681 is an apocalyptic number.

It is an amenable number.

61711351681 is a deficient number, since it is larger than the sum of its proper divisors (11882310143).

61711351681 is a wasteful number, since it uses less digits than its factorization.

61711351681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383300351.

The product of its digits is 30240, while the sum is 40.

The spelling of 61711351681 in words is "sixty-one billion, seven hundred eleven million, three hundred fifty-one thousand, six hundred eighty-one".