66966977966966 has 24 divisors (see below), whose sum is σ = 127473319842696. Its totient is φ = 26091030376320.

The previous prime is 66966977966929. The next prime is 66966977966971.

66966977966966 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66966977966966² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (98).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31060749371 + ... + 31060751526.

It is an arithmetic number, because the mean of its divisors is an integer number (5311388326779).

Almost surely, 2^{66966977966966} is an apocalyptic number.

66966977966966 is a deficient number, since it is larger than the sum of its proper divisors (60506341875730).

66966977966966 is a wasteful number, since it uses less digits than its factorization.

66966977966966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62121500924 (or 62121500917 counting only the distinct ones).

The product of its digits is 539978068224, while the sum is 98.

The spelling of 66966977966966 in words is "sixty-six trillion, nine hundred sixty-six billion, nine hundred seventy-seven million, nine hundred sixty-six thousand, nine hundred sixty-six".