642706966 has 8 divisors (see below), whose sum is σ = 1051702344. Its totient is φ = 292139520.

The previous prime is 642706921. The next prime is 642706969. The reversal of 642706966 is 669607246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×642706966³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642706969) 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, 14606955 + ... + 14606998.

It is an arithmetic number, because the mean of its divisors is an integer number (131462793).

Almost surely, 2^642706966 is an apocalyptic number.

642706966 is a deficient number, since it is larger than the sum of its proper divisors (408995378).

642706966 is a wasteful number, since it uses less digits than its factorization.

642706966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29213966.

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 642706966 is about 25351.6659413144. The cubic root of 642706966 is about 862.9871631666.

The spelling of 642706966 in words is "six hundred forty-two million, seven hundred six thousand, nine hundred sixty-six".