66809402 has 16 divisors (see below), whose sum is σ = 112852224. Its totient is φ = 29388000.

The previous prime is 66809399. The next prime is 66809443. The reversal of 66809402 is 20490866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48299 + ... + 49662.

It is an arithmetic number, because the mean of its divisors is an integer number (7053264).

Almost surely, 2^66809402 is an apocalyptic number.

66809402 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66809402 is a deficient number, since it is larger than the sum of its proper divisors (46042822).

66809402 is a wasteful number, since it uses less digits than its factorization.

66809402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98005.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66809402 is about 8173.7018541173. The cubic root of 66809402 is about 405.7693084683.

The spelling of 66809402 in words is "sixty-six million, eight hundred nine thousand, four hundred two".