66212770 has 16 divisors (see below), whose sum is σ = 128351160. Its totient is φ = 24447744.

The previous prime is 66212761. The next prime is 66212779. The reversal of 66212770 is 7721266.

It is an interprime number because it is at equal distance from previous prime (66212761) and next prime (66212779).

It can be written as a sum of positive squares in 4 ways, for example, as 25877569 + 40335201 = 5087^2 + 6351^2 .

It is a super-2 number, since 2×66212770² = 8768261822145800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66212779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254535 + ... + 254794.

Almost surely, 2^66212770 is an apocalyptic number.

66212770 is a deficient number, since it is larger than the sum of its proper divisors (62138390).

66212770 is a wasteful number, since it uses less digits than its factorization.

66212770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509349.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66212770 is about 8137.1229559347. The cubic root of 66212770 is about 404.5578062512.

The spelling of 66212770 in words is "sixty-six million, two hundred twelve thousand, seven hundred seventy".