66992722 has 4 divisors (see below), whose sum is σ = 100489086. Its totient is φ = 33496360.

The previous prime is 66992713. The next prime is 66992743. The reversal of 66992722 is 22729966.

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

It can be written as a sum of positive squares in only one way, i.e., 63536841 + 3455881 = 7971^2 + 1859^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16748179 + ... + 16748182.

Almost surely, 2^66992722 is an apocalyptic number.

66992722 is a deficient number, since it is larger than the sum of its proper divisors (33496364).

66992722 is a wasteful number, since it uses less digits than its factorization.

66992722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33496363.

The product of its digits is 163296, while the sum is 43.

The square root of 66992722 is about 8184.9081851906. The cubic root of 66992722 is about 406.1401030707.

The spelling of 66992722 in words is "sixty-six million, nine hundred ninety-two thousand, seven hundred twenty-two".