66424551 has 32 divisors (see below), whose sum is σ = 97870080. Its totient is φ = 39916800.

The previous prime is 66424541. The next prime is 66424571. The reversal of 66424551 is 15542466.

66424551 = 836² + 837² + ... + 921².

It is not a de Polignac number, because 66424551 - 2²¹ = 64327399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66424511) 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, 100161 + ... + 100821.

It is an arithmetic number, because the mean of its divisors is an integer number (3058440).

Almost surely, 2^66424551 is an apocalyptic number.

66424551 is a deficient number, since it is larger than the sum of its proper divisors (31445529).

66424551 is a wasteful number, since it uses less digits than its factorization.

66424551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its digits is 28800, while the sum is 33.

The square root of 66424551 is about 8150.1258272495. The cubic root of 66424551 is about 404.9886721416.

The spelling of 66424551 in words is "sixty-six million, four hundred twenty-four thousand, five hundred fifty-one".