6669402780 has 48 divisors (see below), whose sum is σ = 18910725120. Its totient is φ = 1755993408.

The previous prime is 6669402767. The next prime is 6669402793. The reversal of 6669402780 is 872049666.

It is an interprime number because it is at equal distance from previous prime (6669402767) and next prime (6669402793).

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, 698784 + ... + 708263.

It is an arithmetic number, because the mean of its divisors is an integer number (393973440).

Almost surely, 2^6669402780 is an apocalyptic number.

6669402780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6669402780 is an abundant number, since it is smaller than the sum of its proper divisors (12241322340).

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

6669402780 is a wasteful number, since it uses less digits than its factorization.

6669402780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407138 (or 1407136 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 6669402780 is about 81666.4115778329. The cubic root of 6669402780 is about 1882.3295006682.

The spelling of 6669402780 in words is "six billion, six hundred sixty-nine million, four hundred two thousand, seven hundred eighty".