70663666 has 4 divisors (see below), whose sum is σ = 105995502. Its totient is φ = 35331832.

The previous prime is 70663657. The next prime is 70663687. The reversal of 70663666 is 66636607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66636607 = 4457 ⋅14951.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 11758041 = 7675^2 + 3429^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17665915 + ... + 17665918.

Almost surely, 2^70663666 is an apocalyptic number.

70663666 is a deficient number, since it is larger than the sum of its proper divisors (35331836).

70663666 is a wasteful number, since it uses less digits than its factorization.

70663666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35331835.

The product of its (nonzero) digits is 163296, while the sum is 40.

The square root of 70663666 is about 8406.1683304583. The cubic root of 70663666 is about 413.4268910370.

The spelling of 70663666 in words is "seventy million, six hundred sixty-three thousand, six hundred sixty-six".