66770903 has 4 divisors (see below), whose sum is σ = 68575560. Its totient is φ = 64966248.

The previous prime is 66770881. The next prime is 66770969. The reversal of 66770903 is 30907766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30907766 = 2 ⋅15453883.

It is a cyclic number.

It is not a de Polignac number, because 66770903 - 2⁸ = 66770647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770003) 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, 902273 + ... + 902346.

It is an arithmetic number, because the mean of its divisors is an integer number (17143890).

Almost surely, 2^66770903 is an apocalyptic number.

66770903 is a deficient number, since it is larger than the sum of its proper divisors (1804657).

66770903 is a wasteful number, since it uses less digits than its factorization.

66770903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804656.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 66770903 is about 8171.3464618752. The cubic root of 66770903 is about 405.6913518046.

The spelling of 66770903 in words is "sixty-six million, seven hundred seventy thousand, nine hundred three".