1661010554 has 32 divisors (see below), whose sum is σ = 2955899520. Its totient is φ = 684919872.

The previous prime is 1661010553. The next prime is 1661010581. The reversal of 1661010554 is 4550101661.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (1661010553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111977 + ... + 125939.

It is an arithmetic number, because the mean of its divisors is an integer number (92371860).

Almost surely, 2^1661010554 is an apocalyptic number.

1661010554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1661010554 is a deficient number, since it is larger than the sum of its proper divisors (1294888966).

1661010554 is a wasteful number, since it uses less digits than its factorization.

1661010554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14294.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1661010554 is about 40755.4972243009. The cubic root of 1661010554 is about 1184.2883688015.

The spelling of 1661010554 in words is "one billion, six hundred sixty-one million, ten thousand, five hundred fifty-four".