66249015 has 32 divisors (see below), whose sum is σ = 125054976. Its totient is φ = 29306880.

The previous prime is 66249011. The next prime is 66249037. The reversal of 66249015 is 51094266.

It is not a de Polignac number, because 66249015 - 2² = 66249011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66249011) 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, 6922 + ... + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (3907968).

Almost surely, 2^66249015 is an apocalyptic number.

66249015 is a deficient number, since it is larger than the sum of its proper divisors (58805961).

66249015 is a wasteful number, since it uses less digits than its factorization.

66249015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20399.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 66249015 is about 8139.3497897559. The cubic root of 66249015 is about 404.6316113644.

The spelling of 66249015 in words is "sixty-six million, two hundred forty-nine thousand, fifteen".