1661061630 has 32 divisors (see below), whose sum is σ = 4005456768. Its totient is φ = 440848800.

The previous prime is 1661061617. The next prime is 1661061671. The reversal of 1661061630 is 361601661.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124876 + ... + 137535.

It is an arithmetic number, because the mean of its divisors is an integer number (125170524).

Almost surely, 2^1661061630 is an apocalyptic number.

1661061630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661061630 is an abundant number, since it is smaller than the sum of its proper divisors (2344395138).

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

1661061630 is a wasteful number, since it uses less digits than its factorization.

1661061630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262632.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1661061630 is about 40756.1238343393. The cubic root of 1661061630 is about 1184.3005076152.

The spelling of 1661061630 in words is "one billion, six hundred sixty-one million, sixty-one thousand, six hundred thirty".