66123716 has 6 divisors (see below), whose sum is σ = 115716510. Its totient is φ = 33061856.

The previous prime is 66123709. The next prime is 66123749. The reversal of 66123716 is 61732166.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 448900 = 8104^2 + 670^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265461 + ... + 8265468.

It is an arithmetic number, because the mean of its divisors is an integer number (19286085).

Almost surely, 2^66123716 is an apocalyptic number.

It is an amenable number.

66123716 is a deficient number, since it is larger than the sum of its proper divisors (49592794).

66123716 is a wasteful number, since it uses less digits than its factorization.

66123716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16530933 (or 16530931 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 66123716 is about 8131.6490332527. The cubic root of 66123716 is about 404.3763525584.

The spelling of 66123716 in words is "sixty-six million, one hundred twenty-three thousand, seven hundred sixteen".