66916061 has 4 divisors (see below), whose sum is σ = 67033824. Its totient is φ = 66798300.

The previous prime is 66916027. The next prime is 66916067. The reversal of 66916061 is 16061966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66916061 - 2⁶ = 66915997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66916067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58025 + ... + 59166.

It is an arithmetic number, because the mean of its divisors is an integer number (16758456).

Almost surely, 2^66916061 is an apocalyptic number.

It is an amenable number.

66916061 is a deficient number, since it is larger than the sum of its proper divisors (117763).

66916061 is a wasteful number, since it uses less digits than its factorization.

66916061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117762.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 66916061 is about 8180.2237744453. The cubic root of 66916061 is about 405.9851260860.

The spelling of 66916061 in words is "sixty-six million, nine hundred sixteen thousand, sixty-one".