66948551207 has 4 divisors (see below), whose sum is σ = 70886701296. Its totient is φ = 63010401120.

The previous prime is 66948551177. The next prime is 66948551209. The reversal of 66948551207 is 70215584966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66948551207 - 2¹² = 66948547111 is a prime.

It is a super-3 number, since 3×66948551207³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66948551209) 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, 1969075019 + ... + 1969075052.

It is an arithmetic number, because the mean of its divisors is an integer number (17721675324).

Almost surely, 2^66948551207 is an apocalyptic number.

66948551207 is a deficient number, since it is larger than the sum of its proper divisors (3938150089).

66948551207 is a wasteful number, since it uses less digits than its factorization.

66948551207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938150088.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 66948551207 in words is "sixty-six billion, nine hundred forty-eight million, five hundred fifty-one thousand, two hundred seven".