1661933550 has 24 divisors (see below), whose sum is σ = 4121595576. Its totient is φ = 443182240.

The previous prime is 1661933543. The next prime is 1661933569. The reversal of 1661933550 is 553391661.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1661933499 and 1661933508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5539629 + ... + 5539928.

It is an arithmetic number, because the mean of its divisors is an integer number (171733149).

Almost surely, 2^1661933550 is an apocalyptic number.

1661933550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661933550 is an abundant number, since it is smaller than the sum of its proper divisors (2459662026).

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

1661933550 is a wasteful number, since it uses less digits than its factorization.

1661933550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11079572 (or 11079567 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 1661933550 is about 40766.8192283872. The cubic root of 1661933550 is about 1184.5076913129.

The spelling of 1661933550 in words is "one billion, six hundred sixty-one million, nine hundred thirty-three thousand, five hundred fifty".