66251344 has 10 divisors (see below), whose sum is σ = 128362010. Its totient is φ = 33125664.

The previous prime is 66251299. The next prime is 66251357. The reversal of 66251344 is 44315266.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 19465744 = 6840^2 + 4412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2070339 + ... + 2070370.

It is an arithmetic number, because the mean of its divisors is an integer number (12836201).

Almost surely, 2^66251344 is an apocalyptic number.

It is an amenable number.

66251344 is a deficient number, since it is larger than the sum of its proper divisors (62110666).

66251344 is a wasteful number, since it uses less digits than its factorization.

66251344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140717 (or 4140711 counting only the distinct ones).

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

The square root of 66251344 is about 8139.4928588948. The cubic root of 66251344 is about 404.6363529492.

The spelling of 66251344 in words is "sixty-six million, two hundred fifty-one thousand, three hundred forty-four".