66906951 has 8 divisors (see below), whose sum is σ = 94456944. Its totient is φ = 41980800.

The previous prime is 66906949. The next prime is 66906953. The reversal of 66906951 is 15960966.

It is an interprime number because it is at equal distance from previous prime (66906949) and next prime (66906953).

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

It is not a de Polignac number, because 66906951 - 2¹ = 66906949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66906953) 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, 655900 + ... + 656001.

It is an arithmetic number, because the mean of its divisors is an integer number (11807118).

Almost surely, 2^66906951 is an apocalyptic number.

66906951 is a deficient number, since it is larger than the sum of its proper divisors (27549993).

66906951 is a wasteful number, since it uses less digits than its factorization.

66906951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311921.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 66906951 is about 8179.6669247592. Note that the first 3 decimals coincide. The cubic root of 66906951 is about 405.9667015489.

The spelling of 66906951 in words is "sixty-six million, nine hundred six thousand, nine hundred fifty-one".