1880557661 has 6 divisors (see below), whose sum is σ = 1984744062. Its totient is φ = 1781580600.

The previous prime is 1880557631. The next prime is 1880557669. The reversal of 1880557661 is 1667550881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1706185636 + 174372025 = 41306^2 + 13205^2 .

It is not a de Polignac number, because 1880557661 - 2¹⁴ = 1880541277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1880557669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2604290 + ... + 2605011.

It is an arithmetic number, because the mean of its divisors is an integer number (330790677).

Almost surely, 2^1880557661 is an apocalyptic number.

It is an amenable number.

1880557661 is a deficient number, since it is larger than the sum of its proper divisors (104186401).

1880557661 is an equidigital number, since it uses as much as digits as its factorization.

1880557661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209339 (or 5209320 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 1880557661 is about 43365.3970464932. The cubic root of 1880557661 is about 1234.3231794437.

The spelling of 1880557661 in words is "one billion, eight hundred eighty million, five hundred fifty-seven thousand, six hundred sixty-one".