1661251460 has 48 divisors (see below), whose sum is σ = 3808546560. Its totient is φ = 603651840.

The previous prime is 1661251439. The next prime is 1661251469. The reversal of 1661251460 is 641521661.

It is not an unprimeable number, because it can be changed into a prime (1661251469) 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 15 ways as a sum of consecutive naturals, for example, 598997 + ... + 601763.

It is an arithmetic number, because the mean of its divisors is an integer number (79344720).

Almost surely, 2^1661251460 is an apocalyptic number.

1661251460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661251460 is an abundant number, since it is smaller than the sum of its proper divisors (2147295100).

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

1661251460 is a wasteful number, since it uses less digits than its factorization.

1661251460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516 (or 5514 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1661251460 is about 40758.4526202848. The cubic root of 1661251460 is about 1184.3456207721.

The spelling of 1661251460 in words is "one billion, six hundred sixty-one million, two hundred fifty-one thousand, four hundred sixty".