66251020 has 24 divisors (see below), whose sum is σ = 151775568. Its totient is φ = 24091200.

The previous prime is 66250997. The next prime is 66251021. The reversal of 66251020 is 2015266.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 66250982 and 66251000.

It is not an unprimeable number, because it can be changed into a prime (66251021) 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, 150351 + ... + 150790.

It is an arithmetic number, because the mean of its divisors is an integer number (6323982).

Almost surely, 2^66251020 is an apocalyptic number.

It is an amenable number.

66251020 is an abundant number, since it is smaller than the sum of its proper divisors (85524548).

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

66251020 is a wasteful number, since it uses less digits than its factorization.

66251020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301161 (or 301159 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66251020 is about 8139.4729559106. The cubic root of 66251020 is about 404.6356933279.

Adding to 66251020 its reverse (2015266), we get a palindrome (68266286).

The spelling of 66251020 in words is "sixty-six million, two hundred fifty-one thousand, twenty".