66400510 has 16 divisors (see below), whose sum is σ = 130386672. Its totient is φ = 24145600.

The previous prime is 66400493. The next prime is 66400567. The reversal of 66400510 is 1500466.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301711 + ... + 301930.

It is an arithmetic number, because the mean of its divisors is an integer number (8149167).

Almost surely, 2^66400510 is an apocalyptic number.

66400510 is a deficient number, since it is larger than the sum of its proper divisors (63986162).

66400510 is a wasteful number, since it uses less digits than its factorization.

66400510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603659.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66400510 is about 8148.6508085695. The cubic root of 66400510 is about 404.9398071393.

Adding to 66400510 its reverse (1500466), we get a palindrome (67900976).

The spelling of 66400510 in words is "sixty-six million, four hundred thousand, five hundred ten".