66487421 has 32 divisors (see below), whose sum is σ = 90144768. Its totient is φ = 47355840.

The previous prime is 66487397. The next prime is 66487429. The reversal of 66487421 is 12478466.

It is not a de Polignac number, because 66487421 - 2¹⁸ = 66225277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66487429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126866 + ... + 127388.

It is an arithmetic number, because the mean of its divisors is an integer number (2817024).

Almost surely, 2^66487421 is an apocalyptic number.

It is an amenable number.

66487421 is a deficient number, since it is larger than the sum of its proper divisors (23657347).

66487421 is a wasteful number, since it uses less digits than its factorization.

66487421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its digits is 64512, while the sum is 38.

The square root of 66487421 is about 8153.9819106986. The cubic root of 66487421 is about 405.1164040752.

The spelling of 66487421 in words is "sixty-six million, four hundred eighty-seven thousand, four hundred twenty-one".