1550499966 has 48 divisors (see below), whose sum is σ = 3531194784. Its totient is φ = 490735872.

The previous prime is 1550499961. The next prime is 1550499971. The reversal of 1550499966 is 6699940551.

1550499966 is a `hidden beast` number, since 15 + 50 + 499 + 96 + 6 = 666.

1550499966 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1550499961) and next prime (1550499971).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550499961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43050 + ... + 70386.

It is an arithmetic number, because the mean of its divisors is an integer number (73566558).

Almost surely, 2^1550499966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1550499966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765597392).

1550499966 is an abundant number, since it is smaller than the sum of its proper divisors (1980694818).

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

1550499966 is a wasteful number, since it uses less digits than its factorization.

1550499966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27505 (or 27502 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The square root of 1550499966 is about 39376.3884326636. The cubic root of 1550499966 is about 1157.4189456963.

The spelling of 1550499966 in words is "one billion, five hundred fifty million, four hundred ninety-nine thousand, nine hundred sixty-six".