6649781002 has 8 divisors (see below), whose sum is σ = 10067893056. Its totient is φ = 3293816652.

The previous prime is 6649780993. The next prime is 6649781011. The reversal of 6649781002 is 2001879466.

It is an interprime number because it is at equal distance from previous prime (6649780993) and next prime (6649781011).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6649781002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15536658 + ... + 15537085.

It is an arithmetic number, because the mean of its divisors is an integer number (1258486632).

Almost surely, 2^6649781002 is an apocalyptic number.

6649781002 is a deficient number, since it is larger than the sum of its proper divisors (3418112054).

6649781002 is a wasteful number, since it uses less digits than its factorization.

6649781002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31073852.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 6649781002 is about 81546.1893775546. The cubic root of 6649781002 is about 1880.4817124212.

The spelling of 6649781002 in words is "six billion, six hundred forty-nine million, seven hundred eighty-one thousand, two".