87757778613 has 16 divisors (see below), whose sum is σ = 123620647680. Its totient is φ = 55285895616.

The previous prime is 87757778557. The next prime is 87757778627. The reversal of 87757778613 is 31687775778.

It is not a de Polignac number, because 87757778613 - 2¹⁶ = 87757713077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87757778663) 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, 10726870 + ... + 10735047.

It is an arithmetic number, because the mean of its divisors is an integer number (7726290480).

Almost surely, 2^87757778613 is an apocalyptic number.

It is an amenable number.

87757778613 is a deficient number, since it is larger than the sum of its proper divisors (35862869067).

87757778613 is a wasteful number, since it uses less digits than its factorization.

87757778613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21461996.

The product of its digits is 96808320, while the sum is 66.

The spelling of 87757778613 in words is "eighty-seven billion, seven hundred fifty-seven million, seven hundred seventy-eight thousand, six hundred thirteen".