66605070 has 64 divisors (see below), whose sum is σ = 192314880. Its totient is φ = 14421888.

The previous prime is 66605059. The next prime is 66605117. The reversal of 66605070 is 7050666.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4357 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (3004920).

Almost surely, 2^66605070 is an apocalyptic number.

66605070 is an abundant number, since it is smaller than the sum of its proper divisors (125709810).

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

66605070 is a wasteful number, since it uses less digits than its factorization.

66605070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16729.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 66605070 is about 8161.1929275076. The cubic root of 66605070 is about 405.3552134342.

The spelling of 66605070 in words is "sixty-six million, six hundred five thousand, seventy".