66351424 has 28 divisors (see below), whose sum is σ = 132016500. Its totient is φ = 33087488.

The previous prime is 66351413. The next prime is 66351431. The reversal of 66351424 is 42415366.

It can be written as a sum of positive squares in 2 ways, for example, as 48441600 + 17909824 = 6960^2 + 4232^2 .

It is a super-2 number, since 2×66351424² = 8805022933655552, which 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 3 ways as a sum of consecutive naturals, for example, 27582 + ... + 29890.

It is an arithmetic number, because the mean of its divisors is an integer number (4714875).

Almost surely, 2^66351424 is an apocalyptic number.

66351424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66351424 is a deficient number, since it is larger than the sum of its proper divisors (65665076).

66351424 is a wasteful number, since it uses less digits than its factorization.

66351424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770 (or 2760 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 66351424 is about 8145.6383420822. The cubic root of 66351424 is about 404.8399997968.

The spelling of 66351424 in words is "sixty-six million, three hundred fifty-one thousand, four hundred twenty-four".