6557121490 has 16 divisors (see below), whose sum is σ = 11849846400. Its totient is φ = 2612398000.

The previous prime is 6557121449. The next prime is 6557121491. The reversal of 6557121490 is 941217556.

It is not an unprimeable number, because it can be changed into a prime (6557121491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303690 + ... + 1308709.

It is an arithmetic number, because the mean of its divisors is an integer number (740615400).

Almost surely, 2^6557121490 is an apocalyptic number.

6557121490 is a deficient number, since it is larger than the sum of its proper divisors (5292724910).

6557121490 is a wasteful number, since it uses less digits than its factorization.

6557121490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612657.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 6557121490 is about 80976.0550409811. The cubic root of 6557121490 is about 1871.7064779600.

The spelling of 6557121490 in words is "six billion, five hundred fifty-seven million, one hundred twenty-one thousand, four hundred ninety".