61686709755 has 32 divisors (see below), whose sum is σ = 107838984960. Its totient is φ = 29862142080.

The previous prime is 61686709729. The next prime is 61686709873. The reversal of 61686709755 is 55790768616.

It is not a de Polignac number, because 61686709755 - 2¹² = 61686705659 is a prime.

It is a super-2 number, since 2×61686709755² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184620 + ... + 396809.

It is an arithmetic number, because the mean of its divisors is an integer number (3369968280).

Almost surely, 2^61686709755 is an apocalyptic number.

61686709755 is a deficient number, since it is larger than the sum of its proper divisors (46152275205).

61686709755 is a wasteful number, since it uses less digits than its factorization.

61686709755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582091.

The product of its (nonzero) digits is 19051200, while the sum is 60.

The spelling of 61686709755 in words is "sixty-one billion, six hundred eighty-six million, seven hundred nine thousand, seven hundred fifty-five".