1661020141 has 16 divisors (see below), whose sum is σ = 1892740608. Its totient is φ = 1442887600.

The previous prime is 1661020099. The next prime is 1661020199. The reversal of 1661020141 is 1410201661.

It is not a de Polignac number, because 1661020141 - 2¹³ = 1661011949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661026141) 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, 297546 + ... + 303076.

It is an arithmetic number, because the mean of its divisors is an integer number (118296288).

Almost surely, 2^1661020141 is an apocalyptic number.

1661020141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1661020141 is a deficient number, since it is larger than the sum of its proper divisors (231720467).

1661020141 is a wasteful number, since it uses less digits than its factorization.

1661020141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6752.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1661020141 is about 40755.6148401665. The cubic root of 1661020141 is about 1184.2906472841.

The spelling of 1661020141 in words is "one billion, six hundred sixty-one million, twenty thousand, one hundred forty-one".