1661060061 has 16 divisors (see below), whose sum is σ = 2461494400. Its totient is φ = 1107074304.

The previous prime is 1661060059. The next prime is 1661060081. The reversal of 1661060061 is 1600601661.

It is not a de Polignac number, because 1661060061 - 2¹ = 1661060059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661060081) 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, 144840 + ... + 155886.

It is an arithmetic number, because the mean of its divisors is an integer number (153843400).

Almost surely, 2^1661060061 is an apocalyptic number.

It is an amenable number.

1661060061 is a deficient number, since it is larger than the sum of its proper divisors (800434339).

1661060061 is a wasteful number, since it uses less digits than its factorization.

1661060061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16625 (or 16619 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1661060061 is about 40756.1045856937. The cubic root of 1661060061 is about 1184.3001347275.

The spelling of 1661060061 in words is "one billion, six hundred sixty-one million, sixty thousand, sixty-one".