1200665564 has 24 divisors (see below), whose sum is σ = 2404106208. Its totient is φ = 513976320.

The previous prime is 1200665563. The next prime is 1200665581. The reversal of 1200665564 is 4655660021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200665561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332 + ... + 49004.

It is an arithmetic number, because the mean of its divisors is an integer number (100171092).

Almost surely, 2^1200665564 is an apocalyptic number.

1200665564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1200665564 is an abundant number, since it is smaller than the sum of its proper divisors (1203440644).

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

1200665564 is a wasteful number, since it uses less digits than its factorization.

1200665564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49565 (or 49563 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1200665564 is about 34650.6214085693. The cubic root of 1200665564 is about 1062.8549960075.

The spelling of 1200665564 in words is "one billion, two hundred million, six hundred sixty-five thousand, five hundred sixty-four".