65661694 has 8 divisors (see below), whose sum is σ = 112562928. Its totient is φ = 28140720.

The previous prime is 65661691. The next prime is 65661697. The reversal of 65661694 is 49616656.

It is an interprime number because it is at equal distance from previous prime (65661691) and next prime (65661697).

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

It is a super-2 number, since 2×65661694² = 8622916117899272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65661694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65661691) 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 3 ways as a sum of consecutive naturals, for example, 2345047 + ... + 2345074.

It is an arithmetic number, because the mean of its divisors is an integer number (14070366).

Almost surely, 2^65661694 is an apocalyptic number.

65661694 is a deficient number, since it is larger than the sum of its proper divisors (46901234).

65661694 is a wasteful number, since it uses less digits than its factorization.

65661694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4690130.

The product of its digits is 233280, while the sum is 43.

The square root of 65661694 is about 8103.1903593585. The cubic root of 65661694 is about 403.4323261026.

The spelling of 65661694 in words is "sixty-five million, six hundred sixty-one thousand, six hundred ninety-four".