66251406 has 32 divisors (see below), whose sum is σ = 143474688. Its totient is φ = 20273760.

The previous prime is 66251389. The next prime is 66251407. The reversal of 66251406 is 60415266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66251407) 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, 12675 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (4483584).

Almost surely, 2^66251406 is an apocalyptic number.

66251406 is an abundant number, since it is smaller than the sum of its proper divisors (77223282).

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

66251406 is a wasteful number, since it uses less digits than its factorization.

66251406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66251406 is about 8139.4966674850. The cubic root of 66251406 is about 404.6364791728.

The spelling of 66251406 in words is "sixty-six million, two hundred fifty-one thousand, four hundred six".