66461263 has 4 divisors (see below), whose sum is σ = 72503208. Its totient is φ = 60419320.

The previous prime is 66461233. The next prime is 66461281. The reversal of 66461263 is 36216466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66461263 - 2¹³ = 66453071 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 (66461233) 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 3 ways as a sum of consecutive naturals, for example, 3020956 + ... + 3020977.

It is an arithmetic number, because the mean of its divisors is an integer number (18125802).

Almost surely, 2^66461263 is an apocalyptic number.

66461263 is a deficient number, since it is larger than the sum of its proper divisors (6041945).

66461263 is a wasteful number, since it uses less digits than its factorization.

66461263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041944.

The product of its digits is 31104, while the sum is 34.

The square root of 66461263 is about 8152.3777513067. The cubic root of 66461263 is about 405.0632690873.

The spelling of 66461263 in words is "sixty-six million, four hundred sixty-one thousand, two hundred sixty-three".