77142727477 has 8 divisors (see below), whose sum is σ = 78030872576. Its totient is φ = 76258968912.

The previous prime is 77142727471. The next prime is 77142727553. The reversal of 77142727477 is 77472724177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77142727477 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 (77142727471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061253 + ... + 1131610.

It is an arithmetic number, because the mean of its divisors is an integer number (9753859072).

Almost surely, 2^77142727477 is an apocalyptic number.

It is an amenable number.

77142727477 is a deficient number, since it is larger than the sum of its proper divisors (888145099).

77142727477 is a wasteful number, since it uses less digits than its factorization.

77142727477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193267.

The product of its digits is 7529536, while the sum is 55.

The spelling of 77142727477 in words is "seventy-seven billion, one hundred forty-two million, seven hundred twenty-seven thousand, four hundred seventy-seven".