66461455 has 8 divisors (see below), whose sum is σ = 79992432. Its totient is φ = 53010048.

The previous prime is 66461419. The next prime is 66461477. The reversal of 66461455 is 55416466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66461455 - 2⁷ = 66461327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18037 + ... + 21406.

It is an arithmetic number, because the mean of its divisors is an integer number (9999054).

Almost surely, 2^66461455 is an apocalyptic number.

66461455 is a deficient number, since it is larger than the sum of its proper divisors (13530977).

66461455 is a wasteful number, since it uses less digits than its factorization.

66461455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39785.

The product of its digits is 86400, while the sum is 37.

The square root of 66461455 is about 8152.3895270037. The cubic root of 66461455 is about 405.0636591495.

The spelling of 66461455 in words is "sixty-six million, four hundred sixty-one thousand, four hundred fifty-five".