1557449966 has 8 divisors (see below), whose sum is σ = 2340820944. Its totient is φ = 777176320.

The previous prime is 1557449947. The next prime is 1557450001. The reversal of 1557449966 is 6699447551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1557449966³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773075 + ... + 775086.

It is an arithmetic number, because the mean of its divisors is an integer number (292602618).

Almost surely, 2^1557449966 is an apocalyptic number.

1557449966 is a deficient number, since it is larger than the sum of its proper divisors (783370978).

1557449966 is a wasteful number, since it uses less digits than its factorization.

1557449966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548666.

The product of its digits is 8164800, while the sum is 56.

The square root of 1557449966 is about 39464.5406155957. The cubic root of 1557449966 is about 1159.1457161406.

The spelling of 1557449966 in words is "one billion, five hundred fifty-seven million, four hundred forty-nine thousand, nine hundred sixty-six".