66696490 has 32 divisors (see below), whose sum is σ = 139261824. Its totient is φ = 22524480.

The previous prime is 66696451. The next prime is 66696493. The reversal of 66696490 is 9469666.

It is a self number, because there is not a number n which added to its sum of digits gives 66696490.

It is not an unprimeable number, because it can be changed into a prime (66696493) 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, 2421 + ... + 11800.

It is an arithmetic number, because the mean of its divisors is an integer number (4351932).

Almost surely, 2^66696490 is an apocalyptic number.

66696490 is an abundant number, since it is smaller than the sum of its proper divisors (72565334).

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

66696490 is a wasteful number, since it uses less digits than its factorization.

66696490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14302.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 66696490 is about 8166.7919038016. The cubic root of 66696490 is about 405.5405878701.

The spelling of 66696490 in words is "sixty-six million, six hundred ninety-six thousand, four hundred ninety".