1661551050 has 96 divisors (see below), whose sum is σ = 4391718912. Its totient is φ = 414758080.

The previous prime is 1661551043. The next prime is 1661551061. The reversal of 1661551050 is 501551661.

It is a super-2 number, since 2×1661551050² = 5521503783512205000, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1661550999 and 1661551017.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157027 + ... + 167273.

It is an arithmetic number, because the mean of its divisors is an integer number (45747072).

Almost surely, 2^1661551050 is an apocalyptic number.

1661551050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661551050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195859456).

1661551050 is an abundant number, since it is smaller than the sum of its proper divisors (2730167862).

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

1661551050 is a wasteful number, since it uses less digits than its factorization.

1661551050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332 (or 10327 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1661551050 is about 40762.1276431935. The cubic root of 1661551050 is about 1184.4168114348.

The spelling of 1661551050 in words is "one billion, six hundred sixty-one million, five hundred fifty-one thousand, fifty".