1661039670 has 32 divisors (see below), whose sum is σ = 4123962720. Its totient is φ = 427669760.

The previous prime is 1661039669. The next prime is 1661039693. The reversal of 1661039670 is 769301661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953751 + ... + 955490.

It is an arithmetic number, because the mean of its divisors is an integer number (128873835).

Almost surely, 2^1661039670 is an apocalyptic number.

1661039670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661039670 is an abundant number, since it is smaller than the sum of its proper divisors (2462923050).

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

1661039670 is a wasteful number, since it uses less digits than its factorization.

1661039670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909280.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 1661039670 is about 40755.8544260822. The cubic root of 1661039670 is about 1184.2952885927.

It can be divided in two parts, 16610 and 39670, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 1661039670 in words is "one billion, six hundred sixty-one million, thirty-nine thousand, six hundred seventy".