128977780533 has 16 divisors (see below), whose sum is σ = 196652626560. Its totient is φ = 73658442816.

The previous prime is 128977780531. The next prime is 128977780583. The reversal of 128977780533 is 335087779821.

It is a happy number.

It is not a de Polignac number, because 128977780533 - 2¹ = 128977780531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128977780531) 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, 1761010 + ... + 1832787.

It is an arithmetic number, because the mean of its divisors is an integer number (12290789160).

Almost surely, 2^128977780533 is an apocalyptic number.

It is an amenable number.

128977780533 is a deficient number, since it is larger than the sum of its proper divisors (67674846027).

128977780533 is a wasteful number, since it uses less digits than its factorization.

128977780533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595516.

The product of its (nonzero) digits is 17781120, while the sum is 60.

The spelling of 128977780533 in words is "one hundred twenty-eight billion, nine hundred seventy-seven million, seven hundred eighty thousand, five hundred thirty-three".