1272540236645 has 8 divisors (see below), whose sum is σ = 1527328972440. Its totient is φ = 1017845063680.

The previous prime is 1272540236587. The next prime is 1272540236677. The reversal of 1272540236645 is 5466320452721.

It can be written as a sum of positive squares in 4 ways, for example, as 78190699876 + 1194349536769 = 279626^2 + 1092863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1272540236645 - 2⁸ = 1272540236389 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272540236645.

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, 23360780 + ... + 23415189.

It is an arithmetic number, because the mean of its divisors is an integer number (190916121555).

Almost surely, 2^{1272540236645} is an apocalyptic number.

It is an amenable number.

1272540236645 is a deficient number, since it is larger than the sum of its proper divisors (254788735795).

1272540236645 is an equidigital number, since it uses as much as digits as its factorization.

1272540236645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46781415.

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 1272540236645 in words is "one trillion, two hundred seventy-two billion, five hundred forty million, two hundred thirty-six thousand, six hundred forty-five".