66786958 has 16 divisors (see below), whose sum is σ = 118185984. Its totient is φ = 27699480.

The previous prime is 66786949. The next prime is 66786959. The reversal of 66786958 is 85968766.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66786899 and 66786908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66786959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76510 + ... + 77377.

It is an arithmetic number, because the mean of its divisors is an integer number (7386624).

Almost surely, 2^66786958 is an apocalyptic number.

66786958 is a deficient number, since it is larger than the sum of its proper divisors (51399026).

66786958 is a wasteful number, since it uses less digits than its factorization.

66786958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153927.

The product of its digits is 4354560, while the sum is 55.

The square root of 66786958 is about 8172.3287990633. The cubic root of 66786958 is about 405.7238652318.

The spelling of 66786958 in words is "sixty-six million, seven hundred eighty-six thousand, nine hundred fifty-eight".