77786620661585 has 16 divisors (see below), whose sum is σ = 102038854004352. Its totient is φ = 56455923283200.

The previous prime is 77786620661569. The next prime is 77786620661609. The reversal of 77786620661585 is 58516602668777.

It is not a de Polignac number, because 77786620661585 - 2⁴ = 77786620661569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452028856 + ... + 1452082425.

It is an arithmetic number, because the mean of its divisors is an integer number (6377428375272).

Almost surely, 2^{77786620661585} is an apocalyptic number.

It is an amenable number.

77786620661585 is a deficient number, since it is larger than the sum of its proper divisors (24252233342767).

77786620661585 is a wasteful number, since it uses less digits than its factorization.

77786620661585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904111784.

The product of its (nonzero) digits is 1422489600, while the sum is 74.

The spelling of 77786620661585 in words is "seventy-seven trillion, seven hundred eighty-six billion, six hundred twenty million, six hundred sixty-one thousand, five hundred eighty-five".