1264738655236 has 27 divisors (see below), whose sum is σ = 2574678599829. Its totient is φ = 542024104608.

The previous prime is 1264738655231. The next prime is 1264738655251. The reversal of 1264738655236 is 6325568374621.

The square root of 1264738655236 is 1124606.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1048178725636 + 216559929600 = 1023806^2 + 465360^2 .

It is not an unprimeable number, because it can be changed into a prime (1264738655231) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15704320 + ... + 15784648.

Almost surely, 2^{1264738655236} is an apocalyptic number.

1264738655236 is the 1124606-th square number.

It is an amenable number.

1264738655236 is an abundant number, since it is smaller than the sum of its proper divisors (1309939944593).

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

1264738655236 is an frugal number, since it uses more digits than its factorization.

1264738655236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160676 (or 80338 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 58.

The spelling of 1264738655236 in words is "one trillion, two hundred sixty-four billion, seven hundred thirty-eight million, six hundred fifty-five thousand, two hundred thirty-six".