66820741 has 12 divisors (see below), whose sum is σ = 72672960. Its totient is φ = 61410960.

The previous prime is 66820711. The next prime is 66820759. The reversal of 66820741 is 14702866.

It is not a de Polignac number, because 66820741 - 2¹¹ = 66818693 is a prime.

It is a super-2 number, since 2×66820741² = 8930022855578162, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66820697 and 66820706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66820711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45070 + ... + 46528.

It is an arithmetic number, because the mean of its divisors is an integer number (6056080).

Almost surely, 2^66820741 is an apocalyptic number.

It is an amenable number.

66820741 is a deficient number, since it is larger than the sum of its proper divisors (5852219).

66820741 is a wasteful number, since it uses less digits than its factorization.

66820741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756 (or 1743 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66820741 is about 8174.3954516527. The cubic root of 66820741 is about 405.7922631113.

The spelling of 66820741 in words is "sixty-six million, eight hundred twenty thousand, seven hundred forty-one".