1266002500 has 120 divisors (see below), whose sum is σ = 3210572288. Its totient is φ = 427680000.

The previous prime is 1266002497. The next prime is 1266002503. The reversal of 1266002500 is 52006621.

It is an interprime number because it is at equal distance from previous prime (1266002497) and next prime (1266002503).

It is not an unprimeable number, because it can be changed into a prime (1266002503) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1277005 + ... + 1277995.

Almost surely, 2^1266002500 is an apocalyptic number.

1266002500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266002500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1605286144).

1266002500 is an abundant number, since it is smaller than the sum of its proper divisors (1944569788).

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

1266002500 is an equidigital number, since it uses as much as digits as its factorization.

1266002500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1266002500 is about 35580.9288805113. The cubic root of 1266002500 is about 1081.7947125633.

The spelling of 1266002500 in words is "one billion, two hundred sixty-six million, two thousand, five hundred".