66456459949 has 4 divisors (see below), whose sum is σ = 72497956320. Its totient is φ = 60414963580.

The previous prime is 66456459931. The next prime is 66456460019. The reversal of 66456459949 is 94995465466.

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 66456459949 - 2⁹ = 66456459437 is a prime.

It is a super-2 number, since 2×66456459949² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66456409949) 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, 3020748169 + ... + 3020748190.

It is an arithmetic number, because the mean of its divisors is an integer number (18124489080).

Almost surely, 2^66456459949 is an apocalyptic number.

It is an amenable number.

66456459949 is a deficient number, since it is larger than the sum of its proper divisors (6041496371).

66456459949 is a wasteful number, since it uses less digits than its factorization.

66456459949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041496370.

The product of its digits is 251942400, while the sum is 67.

The spelling of 66456459949 in words is "sixty-six billion, four hundred fifty-six million, four hundred fifty-nine thousand, nine hundred forty-nine".