1281780495250 has 32 divisors (see below), whose sum is σ = 2503818884736. Its totient is φ = 490420361200.

The previous prime is 1281780495239. The next prime is 1281780495253. The reversal of 1281780495250 is 525940871821.

It is a super-2 number, since 2×1281780495250² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1281780495253) 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, 111453424 + ... + 111464923.

It is an arithmetic number, because the mean of its divisors is an integer number (78244340148).

Almost surely, 2^{1281780495250} is an apocalyptic number.

1281780495250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281780495250 is a deficient number, since it is larger than the sum of its proper divisors (1222038389486).

1281780495250 is a wasteful number, since it uses less digits than its factorization.

1281780495250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222918387 (or 222918377 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 1281780495250 in words is "one trillion, two hundred eighty-one billion, seven hundred eighty million, four hundred ninety-five thousand, two hundred fifty".