66503976 has 192 divisors, whose sum is σ = 217183680. Its totient is φ = 16773120.

The previous prime is 66503953. The next prime is 66503977. The reversal of 66503976 is 67930566.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66503977) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 685560 + ... + 685656.

It is an arithmetic number, because the mean of its divisors is an integer number (1131165).

Almost surely, 2^66503976 is an apocalyptic number.

66503976 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66503976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108591840).

66503976 is an abundant number, since it is smaller than the sum of its proper divisors (150679704).

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

66503976 is a wasteful number, since it uses less digits than its factorization.

66503976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 66503976 is about 8154.9969957076. The cubic root of 66503976 is about 405.1500251993.

The spelling of 66503976 in words is "sixty-six million, five hundred three thousand, nine hundred seventy-six".