1611125780 has 48 divisors (see below), whose sum is σ = 3790717056. Its totient is φ = 570026880.

The previous prime is 1611125777. The next prime is 1611125801. The reversal of 1611125780 is 875211161.

It is a congruent number.

It is an unprimeable number.

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, 90824 + ... + 107103.

It is an arithmetic number, because the mean of its divisors is an integer number (78973272).

Almost surely, 2^1611125780 is an apocalyptic number.

1611125780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1611125780 is an abundant number, since it is smaller than the sum of its proper divisors (2179591276).

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

1611125780 is a wasteful number, since it uses less digits than its factorization.

1611125780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197984 (or 197982 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 32.

The square root of 1611125780 is about 40138.8313232959. The cubic root of 1611125780 is about 1172.3118338771.

The spelling of 1611125780 in words is "one billion, six hundred eleven million, one hundred twenty-five thousand, seven hundred eighty".