1277878079477 has 16 divisors (see below), whose sum is σ = 1340692093440. Its totient is φ = 1215682710000.

The previous prime is 1277878079449. The next prime is 1277878079501. The reversal of 1277878079477 is 7749708787721.

It is not a de Polignac number, because 1277878079477 - 2¹⁰ = 1277878078453 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 (1277878079417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3828974 + ... + 4149312.

It is an arithmetic number, because the mean of its divisors is an integer number (83793255840).

Almost surely, 2^{1277878079477} is an apocalyptic number.

It is an amenable number.

1277878079477 is a deficient number, since it is larger than the sum of its proper divisors (62814013963).

1277878079477 is a wasteful number, since it uses less digits than its factorization.

1277878079477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321304.

The product of its (nonzero) digits is 542126592, while the sum is 74.

The spelling of 1277878079477 in words is "one trillion, two hundred seventy-seven billion, eight hundred seventy-eight million, seventy-nine thousand, four hundred seventy-seven".