66977477 has 8 divisors (see below), whose sum is σ = 78412992. Its totient is φ = 56008800.

The previous prime is 66977461. The next prime is 66977483. The reversal of 66977477 is 77477966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66977477 - 2⁴ = 66977461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66977447) 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, 116399 + ... + 116972.

It is an arithmetic number, because the mean of its divisors is an integer number (9801624).

Almost surely, 2^66977477 is an apocalyptic number.

It is an amenable number.

66977477 is a deficient number, since it is larger than the sum of its proper divisors (11435515).

66977477 is a wasteful number, since it uses less digits than its factorization.

66977477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233419.

The product of its digits is 3111696, while the sum is 53.

The square root of 66977477 is about 8183.9768450308. The cubic root of 66977477 is about 406.1092933777.

The spelling of 66977477 in words is "sixty-six million, nine hundred seventy-seven thousand, four hundred seventy-seven".