1245666656 has 96 divisors (see below), whose sum is σ = 2738292480. Its totient is φ = 554125824.

The previous prime is 1245666647. The next prime is 1245666659. The reversal of 1245666656 is 6566665421.

It is a self number, because there is not a number n which added to its sum of digits gives 1245666656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245666659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1484285 + ... + 1485123.

It is an arithmetic number, because the mean of its divisors is an integer number (28523880).

Almost surely, 2^1245666656 is an apocalyptic number.

1245666656 is a gapful number since it is divisible by the number (16) 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 1245666656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1369146240).

1245666656 is an abundant number, since it is smaller than the sum of its proper divisors (1492625824).

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

1245666656 is a wasteful number, since it uses less digits than its factorization.

1245666656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 980 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 47.

The square root of 1245666656 is about 35294.0031166769. The cubic root of 1245666656 is about 1075.9711162628.

The spelling of 1245666656 in words is "one billion, two hundred forty-five million, six hundred sixty-six thousand, six hundred fifty-six".