66949753 has 16 divisors (see below), whose sum is σ = 74240320. Its totient is φ = 59984064.

The previous prime is 66949741. The next prime is 66949781. The reversal of 66949753 is 35794966.

It is a cyclic number.

It is not a de Polignac number, because 66949753 - 2⁵ = 66949721 is a prime.

It is a super-2 number, since 2×66949753² = 8964538853522018, 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 = 66949697 and 66949706.

It is not an unprimeable number, because it can be changed into a prime (66949733) 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 15 ways as a sum of consecutive naturals, for example, 127750 + ... + 128272.

It is an arithmetic number, because the mean of its divisors is an integer number (4640020).

Almost surely, 2^66949753 is an apocalyptic number.

It is an amenable number.

66949753 is a deficient number, since it is larger than the sum of its proper divisors (7290567).

66949753 is a wasteful number, since it uses less digits than its factorization.

66949753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808.

The product of its digits is 1224720, while the sum is 49.

The square root of 66949753 is about 8182.2828721574. The cubic root of 66949753 is about 406.0532520118.

The spelling of 66949753 in words is "sixty-six million, nine hundred forty-nine thousand, seven hundred fifty-three".