66677556 has 48 divisors (see below), whose sum is σ = 170247168. Its totient is φ = 20143200.

The previous prime is 66677549. The next prime is 66677557. The reversal of 66677556 is 65577666.

It is a super-3 number, since 3×66677556³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60571 + ... + 61661.

It is an arithmetic number, because the mean of its divisors is an integer number (3546816).

Almost surely, 2^66677556 is an apocalyptic number.

66677556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66677556 is an abundant number, since it is smaller than the sum of its proper divisors (103569612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66677556 is a wasteful number, since it uses less digits than its factorization.

66677556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 48.

The square root of 66677556 is about 8165.6326148070. The cubic root of 66677556 is about 405.5022088780.

The spelling of 66677556 in words is "sixty-six million, six hundred seventy-seven thousand, five hundred fifty-six".