66454202420 has 24 divisors (see below), whose sum is σ = 141465524424. Its totient is φ = 26217547776.

The previous prime is 66454202417. The next prime is 66454202459. The reversal of 66454202420 is 2420245466.

It can be written as a sum of positive squares in 4 ways, for example, as 16132048144 + 50322154276 = 127012^2 + 224326^2 .

It is a super-2 number, since 2×66454202420² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22756829 + ... + 22759748.

It is an arithmetic number, because the mean of its divisors is an integer number (5894396851).

Almost surely, 2^66454202420 is an apocalyptic number.

It is an amenable number.

66454202420 is an abundant number, since it is smaller than the sum of its proper divisors (75011322004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66454202420 is a wasteful number, since it uses less digits than its factorization.

66454202420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45516659 (or 45516657 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 66454202420 its reverse (2420245466), we get a palindrome (68874447886).

The spelling of 66454202420 in words is "sixty-six billion, four hundred fifty-four million, two hundred two thousand, four hundred twenty".