66172350651 has 12 divisors (see below), whose sum is σ = 96979864296. Its totient is φ = 40104454720.

The previous prime is 66172350631. The next prime is 66172350653. The reversal of 66172350651 is 15605327166.

It is not a de Polignac number, because 66172350651 - 2¹³ = 66172342459 is a prime.

It is a super-3 number, since 3×66172350651³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66172350653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91146126 + ... + 91146851.

It is an arithmetic number, because the mean of its divisors is an integer number (8081655358).

Almost surely, 2^66172350651 is an apocalyptic number.

66172350651 is a deficient number, since it is larger than the sum of its proper divisors (30807513645).

66172350651 is a wasteful number, since it uses less digits than its factorization.

66172350651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182293002 (or 182292991 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 66172350651 in words is "sixty-six billion, one hundred seventy-two million, three hundred fifty thousand, six hundred fifty-one".