6685157642 has 4 divisors (see below), whose sum is σ = 10027736466. Its totient is φ = 3342578820.

The previous prime is 6685157587. The next prime is 6685157651. The reversal of 6685157642 is 2467515866.

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

It can be written as a sum of positive squares in only one way, i.e., 4845691321 + 1839466321 = 69611^2 + 42889^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671289409 + ... + 1671289412.

Almost surely, 2^6685157642 is an apocalyptic number.

6685157642 is a deficient number, since it is larger than the sum of its proper divisors (3342578824).

6685157642 is a wasteful number, since it uses less digits than its factorization.

6685157642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342578823.

The product of its digits is 2419200, while the sum is 50.

The square root of 6685157642 is about 81762.8133199928. The cubic root of 6685157642 is about 1883.8105188591.

The spelling of 6685157642 in words is "six billion, six hundred eighty-five million, one hundred fifty-seven thousand, six hundred forty-two".