6661381570 has 32 divisors (see below), whose sum is σ = 12627057600. Its totient is φ = 2523214656.

The previous prime is 6661381567. The next prime is 6661381579. The reversal of 6661381570 is 751831666.

It is a super-2 number, since 2×6661381570² = 88748008842271329800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6661381579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529392 + ... + 541828.

It is an arithmetic number, because the mean of its divisors is an integer number (394595550).

Almost surely, 2^6661381570 is an apocalyptic number.

6661381570 is a deficient number, since it is larger than the sum of its proper divisors (5965676030).

6661381570 is a wasteful number, since it uses less digits than its factorization.

6661381570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15282.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 6661381570 is about 81617.2872006905. The cubic root of 6661381570 is about 1881.5745796399.

The spelling of 6661381570 in words is "six billion, six hundred sixty-one million, three hundred eighty-one thousand, five hundred seventy".