66250819 has 16 divisors (see below), whose sum is σ = 73789920. Its totient is φ = 59189760.

The previous prime is 66250801. The next prime is 66250829. The reversal of 66250819 is 91805266.

It is a cyclic number.

It is not a de Polignac number, because 66250819 - 2¹⁵ = 66218051 is a prime.

It is a super-2 number, since 2×66250819² = 8778342036341522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66250829) 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, 28972 + ... + 31174.

It is an arithmetic number, because the mean of its divisors is an integer number (4611870).

Almost surely, 2^66250819 is an apocalyptic number.

66250819 is a deficient number, since it is larger than the sum of its proper divisors (7539101).

66250819 is a wasteful number, since it uses less digits than its factorization.

66250819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 66250819 is about 8139.4606086644. The cubic root of 66250819 is about 404.6352841173.

The spelling of 66250819 in words is "sixty-six million, two hundred fifty thousand, eight hundred nineteen".