66319744 has 16 divisors (see below), whose sum is σ = 132121620. Its totient is φ = 33159808.

The previous prime is 66319727. The next prime is 66319753. The reversal of 66319744 is 44791366.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 66319697 and 66319706.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258934 + ... + 259189.

Almost surely, 2^66319744 is an apocalyptic number.

66319744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66319744 is a deficient number, since it is larger than the sum of its proper divisors (65801876).

66319744 is an equidigital number, since it uses as much as digits as its factorization.

66319744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518137 (or 518125 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 66319744 is about 8143.6935109322. The cubic root of 66319744 is about 404.7755582112.

The spelling of 66319744 in words is "sixty-six million, three hundred nineteen thousand, seven hundred forty-four".