1351666686 has 32 divisors (see below), whose sum is σ = 2744612640. Its totient is φ = 443695104.

The previous prime is 1351666637. The next prime is 1351666697. The reversal of 1351666686 is 6866661531.

It is a happy number.

Its product of digits (933120) is a multiple of the sum of its prime divisors (4860).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334816 + ... + 338828.

It is an arithmetic number, because the mean of its divisors is an integer number (85769145).

Almost surely, 2^1351666686 is an apocalyptic number.

1351666686 is an abundant number, since it is smaller than the sum of its proper divisors (1392945954).

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

1351666686 is a wasteful number, since it uses less digits than its factorization.

1351666686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860.

The product of its digits is 933120, while the sum is 48.

The square root of 1351666686 is about 36765.0198694357. The cubic root of 1351666686 is about 1105.6640865273.

The spelling of 1351666686 in words is "one billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred eighty-six".