1661871470 has 32 divisors (see below), whose sum is σ = 3427688448. Its totient is φ = 568287648.

The previous prime is 1661871433. The next prime is 1661871479. The reversal of 1661871470 is 741781661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661871479) 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, 4184 + ... + 57803.

It is an arithmetic number, because the mean of its divisors is an integer number (107115264).

Almost surely, 2^1661871470 is an apocalyptic number.

1661871470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661871470 is an abundant number, since it is smaller than the sum of its proper divisors (1765816978).

1661871470 is a wasteful number, since it uses less digits than its factorization.

1661871470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62384.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1661871470 is about 40766.0578177483. The cubic root of 1661871470 is about 1184.4929423973.

It can be divided in two parts, 16618 and 71470, that added together give a palindrome (88088).

The spelling of 1661871470 in words is "one billion, six hundred sixty-one million, eight hundred seventy-one thousand, four hundred seventy".