66677746 has 4 divisors (see below), whose sum is σ = 100016622. Its totient is φ = 33338872.

The previous prime is 66677731. The next prime is 66677761. The reversal of 66677746 is 64777666.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66677731) and next prime (66677761).

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 15912121 = 7125^2 + 3989^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66677746.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16669435 + ... + 16669438.

Almost surely, 2^66677746 is an apocalyptic number.

66677746 is a deficient number, since it is larger than the sum of its proper divisors (33338876).

66677746 is a wasteful number, since it uses less digits than its factorization.

66677746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33338875.

The product of its digits is 1778112, while the sum is 49.

The square root of 66677746 is about 8165.6442489249. The cubic root of 66677746 is about 405.5025940418.

The spelling of 66677746 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred forty-six".