1275780401905 has 16 divisors (see below), whose sum is σ = 1552693048704. Its totient is φ = 1006123538560.

The previous prime is 1275780401887. The next prime is 1275780401927. The reversal of 1275780401905 is 5091040875721.

It is not a de Polignac number, because 1275780401905 - 2³⁵ = 1241420663537 is a prime.

It is a Duffinian number.

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, 2671629 + ... + 3112741.

It is an arithmetic number, because the mean of its divisors is an integer number (97043315544).

Almost surely, 2^{1275780401905} is an apocalyptic number.

It is an amenable number.

1275780401905 is a deficient number, since it is larger than the sum of its proper divisors (276912646799).

1275780401905 is an equidigital number, since it uses as much as digits as its factorization.

1275780401905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449336.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 1275780401905 in words is "one trillion, two hundred seventy-five billion, seven hundred eighty million, four hundred one thousand, nine hundred five".