77861708547 has 8 divisors (see below), whose sum is σ = 118646413056. Its totient is φ = 44492404872.

The previous prime is 77861708453. The next prime is 77861708549. The reversal of 77861708547 is 74580716877.

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

It is not a de Polignac number, because 77861708547 - 2¹² = 77861704451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77861708549) 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, 1853850183 + ... + 1853850224.

It is an arithmetic number, because the mean of its divisors is an integer number (14830801632).

Almost surely, 2^77861708547 is an apocalyptic number.

77861708547 is a deficient number, since it is larger than the sum of its proper divisors (40784704509).

77861708547 is a wasteful number, since it uses less digits than its factorization.

77861708547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707700417.

The product of its (nonzero) digits is 18439680, while the sum is 60.

The spelling of 77861708547 in words is "seventy-seven billion, eight hundred sixty-one million, seven hundred eight thousand, five hundred forty-seven".