66754149653 has 2 divisors, whose sum is σ = 66754149654. Its totient is φ = 66754149652.

The previous prime is 66754149617. The next prime is 66754149697. The reversal of 66754149653 is 35694145766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65588746609 + 1165403044 = 256103^2 + 34138^2 .

It is a cyclic number.

It is not a de Polignac number, because 66754149653 - 2²⁴ = 66737372437 is a prime.

It is a super-2 number, since 2×66754149653² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66754139653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33377074826 + 33377074827.

It is an arithmetic number, because the mean of its divisors is an integer number (33377074827).

Almost surely, 2^66754149653 is an apocalyptic number.

It is an amenable number.

66754149653 is a deficient number, since it is larger than the sum of its proper divisors (1).

66754149653 is an equidigital number, since it uses as much as digits as its factorization.

66754149653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 56.

The spelling of 66754149653 in words is "sixty-six billion, seven hundred fifty-four million, one hundred forty-nine thousand, six hundred fifty-three".