1266610428636 has 96 divisors (see below), whose sum is σ = 3401390630400. Its totient is φ = 359345735424.

The previous prime is 1266610428631. The next prime is 1266610428641. The reversal of 1266610428636 is 6368240166621.

It is an interprime number because it is at equal distance from previous prime (1266610428631) and next prime (1266610428641).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266610428631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20397211 + ... + 20459213.

It is an arithmetic number, because the mean of its divisors is an integer number (35431152400).

Almost surely, 2^{1266610428636} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266610428636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1700695315200).

1266610428636 is an abundant number, since it is smaller than the sum of its proper divisors (2134780201764).

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

1266610428636 is a wasteful number, since it uses less digits than its factorization.

1266610428636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63723 (or 63721 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 1266610428636 in words is "one trillion, two hundred sixty-six billion, six hundred ten million, four hundred twenty-eight thousand, six hundred thirty-six".