61660719 has 12 divisors (see below), whose sum is σ = 93753400. Its totient is φ = 38943504.

The previous prime is 61660657. The next prime is 61660777. The reversal of 61660719 is 91706616.

It is not a de Polignac number, because 61660719 - 2⁷ = 61660591 is a prime.

It is a super-2 number, since 2×61660719² = 7604088535193922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180124 + ... + 180465.

Almost surely, 2^61660719 is an apocalyptic number.

61660719 is a deficient number, since it is larger than the sum of its proper divisors (32092681).

61660719 is a wasteful number, since it uses less digits than its factorization.

61660719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360614 (or 360611 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 61660719 is about 7852.4339538770. The cubic root of 61660719 is about 395.0658844329.

The spelling of 61660719 in words is "sixty-one million, six hundred sixty thousand, seven hundred nineteen".