1499778663 has 4 divisors (see below), whose sum is σ = 1999704888. Its totient is φ = 999852440.

The previous prime is 1499778629. The next prime is 1499778677. The reversal of 1499778663 is 3668779941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1499778663 - 2¹² = 1499774567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1499778597 and 1499778606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1499778563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249963108 + ... + 249963113.

It is an arithmetic number, because the mean of its divisors is an integer number (499926222).

Almost surely, 2^1499778663 is an apocalyptic number.

1499778663 is a deficient number, since it is larger than the sum of its proper divisors (499926225).

1499778663 is an equidigital number, since it uses as much as digits as its factorization.

1499778663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499926224.

The product of its digits is 13716864, while the sum is 60.

The square root of 1499778663 is about 38726.9759082736. The cubic root of 1499778663 is about 1144.6579358690.

The spelling of 1499778663 in words is "one billion, four hundred ninety-nine million, seven hundred seventy-eight thousand, six hundred sixty-three".