1261323012360 has 64 divisors (see below), whose sum is σ = 3797629675200. Its totient is φ = 335138524416.

The previous prime is 1261323012347. The next prime is 1261323012403. The reversal of 1261323012360 is 632103231621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18939730 + ... + 19006209.

It is an arithmetic number, because the mean of its divisors is an integer number (59337963675).

Almost surely, 2^{1261323012360} is an apocalyptic number.

1261323012360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261323012360 is an abundant number, since it is smaller than the sum of its proper divisors (2536306662840).

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

1261323012360 is a wasteful number, since it uses less digits than its factorization.

1261323012360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37946230 (or 37946226 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

Adding to 1261323012360 its reverse (632103231621), we get a palindrome (1893426243981).

The spelling of 1261323012360 in words is "one trillion, two hundred sixty-one billion, three hundred twenty-three million, twelve thousand, three hundred sixty".