66487426 has 4 divisors (see below), whose sum is σ = 99731142. Its totient is φ = 33243712.

The previous prime is 66487397. The next prime is 66487429. The reversal of 66487426 is 62478466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62478466 = 2 ⋅31239233.

It can be written as a sum of positive squares in only one way, i.e., 66406201 + 81225 = 8149^2 + 285^2 .

It is a super-3 number, since 3×66487426³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 as a sum of consecutive naturals, namely, 16621855 + ... + 16621858.

Almost surely, 2^66487426 is an apocalyptic number.

66487426 is a deficient number, since it is larger than the sum of its proper divisors (33243716).

66487426 is a wasteful number, since it uses less digits than its factorization.

66487426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33243715.

The product of its digits is 387072, while the sum is 43.

The square root of 66487426 is about 8153.9822172973. The cubic root of 66487426 is about 405.1164142304.

The spelling of 66487426 in words is "sixty-six million, four hundred eighty-seven thousand, four hundred twenty-six".