66851004 has 96 divisors (see below), whose sum is σ = 186181632. Its totient is φ = 18451200.

The previous prime is 66850999. The next prime is 66851009. The reversal of 66851004 is 40015866.

It is an interprime number because it is at equal distance from previous prime (66850999) and next prime (66851009).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66851009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2156469 + ... + 2156499.

It is an arithmetic number, because the mean of its divisors is an integer number (1939392).

Almost surely, 2^66851004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66851004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93090816).

66851004 is an abundant number, since it is smaller than the sum of its proper divisors (119330628).

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

66851004 is a wasteful number, since it uses less digits than its factorization.

66851004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 66851004 is about 8176.2463270134. The cubic root of 66851004 is about 405.8535147407.

The spelling of 66851004 in words is "sixty-six million, eight hundred fifty-one thousand, four".