2780243647501 has 12 divisors (see below), whose sum is σ = 2906725262140. Its totient is φ = 2659047082560.

The previous prime is 2780243647471. The next prime is 2780243647607. The reversal of 2780243647501 is 1057463420872.

It can be written as a sum of positive squares in 2 ways, for example, as 1621359102276 + 1158884545225 = 1273326^2 + 1076515^2 .

It is not a de Polignac number, because 2780243647501 - 2⁷ = 2780243647373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780243647901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4199215 + ... + 4816003.

Almost surely, 2^{2780243647501} is an apocalyptic number.

It is an amenable number.

2780243647501 is a deficient number, since it is larger than the sum of its proper divisors (126481614639).

2780243647501 is an equidigital number, since it uses as much as digits as its factorization.

2780243647501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625356 (or 625333 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 49.

The spelling of 2780243647501 in words is "two trillion, seven hundred eighty billion, two hundred forty-three million, six hundred forty-seven thousand, five hundred one".