77620349185 has 32 divisors (see below), whose sum is σ = 97592545440. Its totient is φ = 59190018048.

The previous prime is 77620349153. The next prime is 77620349251. The reversal of 77620349185 is 58194302677.

It can be written as a sum of positive squares in 16 ways, for example, as 12673355776 + 64946993409 = 112576^2 + 254847^2 .

It is a 4-Lehmer number, since φ(77620349185) divides (77620349185-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 77620349185 - 2⁵ = 77620349153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4201729 + ... + 4220161.

It is an arithmetic number, because the mean of its divisors is an integer number (3049767045).

It is a 2-persistent number, because it is pandigital, and so is 2⋅77620349185 = 155240698370, but 3⋅77620349185 = 232861047555 is not.

Almost surely, 2^77620349185 is an apocalyptic number.

It is an amenable number.

77620349185 is a deficient number, since it is larger than the sum of its proper divisors (19972196255).

77620349185 is a wasteful number, since it uses less digits than its factorization.

77620349185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18837.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 77620349185 in words is "seventy-seven billion, six hundred twenty million, three hundred forty-nine thousand, one hundred eighty-five".