66951844 has 6 divisors (see below), whose sum is σ = 117165734. Its totient is φ = 33475920.

The previous prime is 66951823. The next prime is 66951869. The reversal of 66951844 is 44815966.

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 24206400 = 6538^2 + 4920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66951844.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8368977 + ... + 8368984.

Almost surely, 2^66951844 is an apocalyptic number.

It is an amenable number.

66951844 is a deficient number, since it is larger than the sum of its proper divisors (50213890).

66951844 is a wasteful number, since it uses less digits than its factorization.

66951844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16737965 (or 16737963 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 66951844 is about 8182.4106472359. The cubic root of 66951844 is about 406.0574793041.

The spelling of 66951844 in words is "sixty-six million, nine hundred fifty-one thousand, eight hundred forty-four".