61706681 has 16 divisors (see below), whose sum is σ = 65454480. Its totient is φ = 58106880.

The previous prime is 61706669. The next prime is 61706683. The reversal of 61706681 is 18660716.

It can be written as a sum of positive squares in 8 ways, for example, as 4477456 + 57229225 = 2116^2 + 7565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61706681 is a prime.

It is a super-2 number, since 2×61706681² = 7615428960071522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61706683) 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, 158435 + ... + 158823.

It is an arithmetic number, because the mean of its divisors is an integer number (4090905).

Almost surely, 2^61706681 is an apocalyptic number.

It is an amenable number.

61706681 is a deficient number, since it is larger than the sum of its proper divisors (3747799).

61706681 is a wasteful number, since it uses less digits than its factorization.

61706681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 61706681 is about 7855.3600172112. The cubic root of 61706681 is about 395.1640209703.

The spelling of 61706681 in words is "sixty-one million, seven hundred six thousand, six hundred eighty-one".