70666187 has 4 divisors (see below), whose sum is σ = 74385480. Its totient is φ = 66946896.

The previous prime is 70666177. The next prime is 70666199. The reversal of 70666187 is 78166607.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70666187 - 2¹⁸ = 70404043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70666147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859618 + ... + 1859655.

It is an arithmetic number, because the mean of its divisors is an integer number (18596370).

Almost surely, 2^70666187 is an apocalyptic number.

70666187 is a deficient number, since it is larger than the sum of its proper divisors (3719293).

70666187 is a wasteful number, since it uses less digits than its factorization.

70666187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719292.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 70666187 is about 8406.3182785331. The cubic root of 70666187 is about 413.4318074570.

The spelling of 70666187 in words is "seventy million, six hundred sixty-six thousand, one hundred eighty-seven".