77855152425889 has 16 divisors (see below), whose sum is σ = 80039753804304. Its totient is φ = 75684342988800.

The previous prime is 77855152425881. The next prime is 77855152425901. The reversal of 77855152425889 is 98852425155877.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 42535701363600 + 35319451062289 = 6521940^2 + 5943017^2 .

It is a cyclic number.

It is not a de Polignac number, because 77855152425889 - 2³ = 77855152425881 is a prime.

It is a super-2 number, since 2×77855152425889² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77855152425881) 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, 32106129 + ... + 34445809.

It is an arithmetic number, because the mean of its divisors is an integer number (5002484612769).

Almost surely, 2^{77855152425889} is an apocalyptic number.

It is an amenable number.

77855152425889 is a deficient number, since it is larger than the sum of its proper divisors (2184601378415).

77855152425889 is a wasteful number, since it uses less digits than its factorization.

77855152425889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342628.

The product of its digits is 2257920000, while the sum is 76.

The spelling of 77855152425889 in words is "seventy-seven trillion, eight hundred fifty-five billion, one hundred fifty-two million, four hundred twenty-five thousand, eight hundred eighty-nine".