1276639738045 has 24 divisors (see below), whose sum is σ = 1782964725984. Its totient is φ = 874977890976.

The previous prime is 1276639738039. The next prime is 1276639738069. The reversal of 1276639738045 is 5408379366721.

It is a happy number.

It is not a de Polignac number, because 1276639738045 - 2⁵ = 1276639738013 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 788727 + ... + 1781956.

It is an arithmetic number, because the mean of its divisors is an integer number (74290196916).

It is a 1-persistent number, because it is pandigital, but 2⋅1276639738045 = 2553279476090 is not.

Almost surely, 2^{1276639738045} is an apocalyptic number.

It is an amenable number.

1276639738045 is a deficient number, since it is larger than the sum of its proper divisors (506324987939).

1276639738045 is a wasteful number, since it uses less digits than its factorization.

1276639738045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572729 (or 2572722 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 1276639738045 in words is "one trillion, two hundred seventy-six billion, six hundred thirty-nine million, seven hundred thirty-eight thousand, forty-five".