66251201 has 16 divisors (see below), whose sum is σ = 71675904. Its totient is φ = 61072704.

The previous prime is 66251191. The next prime is 66251221. The reversal of 66251201 is 10215266.

It is a cyclic number.

It is not a de Polignac number, because 66251201 - 2⁶ = 66251137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66251221) 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, 107771 + ... + 108383.

It is an arithmetic number, because the mean of its divisors is an integer number (4479744).

Almost surely, 2^66251201 is an apocalyptic number.

It is an amenable number.

66251201 is a deficient number, since it is larger than the sum of its proper divisors (5424703).

66251201 is a wasteful number, since it uses less digits than its factorization.

66251201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66251201 is about 8139.4840745590. The cubic root of 66251201 is about 404.6360618203.

Adding to 66251201 its reverse (10215266), we get a palindrome (76466467).

The spelling of 66251201 in words is "sixty-six million, two hundred fifty-one thousand, two hundred one".