66277993 has 4 divisors (see below), whose sum is σ = 66324880. Its totient is φ = 66231108.

The previous prime is 66277979. The next prime is 66277999. The reversal of 66277993 is 39977266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66277993 - 2⁵ = 66277961 is a prime.

It is a super-2 number, since 2×66277993² = 8785544712216098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66277999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21255 + ... + 24172.

It is an arithmetic number, because the mean of its divisors is an integer number (16581220).

Almost surely, 2^66277993 is an apocalyptic number.

It is an amenable number.

66277993 is a deficient number, since it is larger than the sum of its proper divisors (46887).

66277993 is a wasteful number, since it uses less digits than its factorization.

66277993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46886.

The product of its digits is 857304, while the sum is 49.

The square root of 66277993 is about 8141.1297127610. The cubic root of 66277993 is about 404.6905994396.

The spelling of 66277993 in words is "sixty-six million, two hundred seventy-seven thousand, nine hundred ninety-three".