1236420735660 has 576 divisors, whose sum is σ = 4365397048320. Its totient is φ = 288110131200.

The previous prime is 1236420735617. The next prime is 1236420735701. The reversal of 1236420735660 is 665370246321.

1236420735660 is a `hidden beast` number, since 1 + 2 + 3 + 64 + 20 + 7 + 3 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 953292132 + ... + 953293428.

It is an arithmetic number, because the mean of its divisors is an integer number (7578814320).

Almost surely, 2^{1236420735660} is an apocalyptic number.

1236420735660 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 1236420735660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2182698524160).

1236420735660 is an abundant number, since it is smaller than the sum of its proper divisors (3128976312660).

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

1236420735660 is a wasteful number, since it uses less digits than its factorization.

1236420735660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

The spelling of 1236420735660 in words is "one trillion, two hundred thirty-six billion, four hundred twenty million, seven hundred thirty-five thousand, six hundred sixty".