77142501855 has 24 divisors (see below), whose sum is σ = 134565361632. Its totient is φ = 40880608704.

The previous prime is 77142501851. The next prime is 77142501911. The reversal of 77142501855 is 55810524177.

It is not a de Polignac number, because 77142501855 - 2² = 77142501851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 77142501855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77142501851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5452419 + ... + 5466548.

It is an arithmetic number, because the mean of its divisors is an integer number (5606890068).

Almost surely, 2^77142501855 is an apocalyptic number.

77142501855 is a deficient number, since it is larger than the sum of its proper divisors (57422859777).

77142501855 is a wasteful number, since it uses less digits than its factorization.

77142501855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10919135 (or 10919132 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 45.

The spelling of 77142501855 in words is "seventy-seven billion, one hundred forty-two million, five hundred one thousand, eight hundred fifty-five".