77420632541 has 12 divisors (see below), whose sum is σ = 90082332828. Its totient is φ = 66344628672.

The previous prime is 77420632537. The next prime is 77420632631. The reversal of 77420632541 is 14523602477.

It can be written as a sum of positive squares in 2 ways, for example, as 66899822500 + 10520810041 = 258650^2 + 102571^2 .

It is not a de Polignac number, because 77420632541 - 2² = 77420632537 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 (77420632241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19295 + ... + 393971.

It is an arithmetic number, because the mean of its divisors is an integer number (7506861069).

Almost surely, 2^77420632541 is an apocalyptic number.

It is an amenable number.

77420632541 is a deficient number, since it is larger than the sum of its proper divisors (12661700287).

77420632541 is a wasteful number, since it uses less digits than its factorization.

77420632541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378908 (or 378901 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 77420632541 in words is "seventy-seven billion, four hundred twenty million, six hundred thirty-two thousand, five hundred forty-one".