66614977 has 12 divisors (see below), whose sum is σ = 78855700. Its totient is φ = 55899360.

The previous prime is 66614957. The next prime is 66614981. The reversal of 66614977 is 77941666.

It can be written as a sum of positive squares in 2 ways, for example, as 40564161 + 26050816 = 6369^2 + 5104^2 .

It is not a de Polignac number, because 66614977 - 2¹⁵ = 66582209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66614927) 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, 19602 + ... + 22747.

Almost surely, 2^66614977 is an apocalyptic number.

It is an amenable number.

66614977 is a deficient number, since it is larger than the sum of its proper divisors (12240723).

66614977 is a wasteful number, since it uses less digits than its factorization.

66614977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42384 (or 42373 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The square root of 66614977 is about 8161.7998627754. The cubic root of 66614977 is about 405.3753102777.

The spelling of 66614977 in words is "sixty-six million, six hundred fourteen thousand, nine hundred seventy-seven".