66677820 has 48 divisors (see below), whose sum is σ = 203672448. Its totient is φ = 16164160.

The previous prime is 66677813. The next prime is 66677827. The reversal of 66677820 is 2877666.

It is an interprime number because it is at equal distance from previous prime (66677813) and next prime (66677827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677827) 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, 49854 + ... + 51173.

It is an arithmetic number, because the mean of its divisors is an integer number (4243176).

Almost surely, 2^66677820 is an apocalyptic number.

66677820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66677820 is an abundant number, since it is smaller than the sum of its proper divisors (136994628).

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

66677820 is a wasteful number, since it uses less digits than its factorization.

66677820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101050 (or 101048 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 66677820 is about 8165.6487801031. The cubic root of 66677820 is about 405.5027440528.

The spelling of 66677820 in words is "sixty-six million, six hundred seventy-seven thousand, eight hundred twenty".