1254344816640 has 96 divisors (see below), whose sum is σ = 4012923554640. Its totient is φ = 334491942912.

The previous prime is 1254344816623. The next prime is 1254344816663. The reversal of 1254344816640 is 466184434521.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1254344816640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20385049 + ... + 20446488.

Almost surely, 2^{1254344816640} is an apocalyptic number.

1254344816640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1254344816640 is an abundant number, since it is smaller than the sum of its proper divisors (2758578738000).

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

1254344816640 is an equidigital number, since it uses as much as digits as its factorization.

1254344816640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40831567 (or 40831547 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 1254344816640 in words is "one trillion, two hundred fifty-four billion, three hundred forty-four million, eight hundred sixteen thousand, six hundred forty".