77581189156 has 9 divisors (see below), whose sum is σ = 135768055899. Its totient is φ = 38790316044.

The previous prime is 77581189123. The next prime is 77581189159. The reversal of 77581189156 is 65198118577.

The square root of 77581189156 is 278534.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77581189156.

It is not an unprimeable number, because it can be changed into a prime (77581189159) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 487435 + ... + 626701.

Almost surely, 2^77581189156 is an apocalyptic number.

77581189156 is the 278534-th square number.

It is an amenable number.

77581189156 is a deficient number, since it is larger than the sum of its proper divisors (58186866743).

77581189156 is an frugal number, since it uses more digits than its factorization.

77581189156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278538 (or 139269 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 58.

The spelling of 77581189156 in words is "seventy-seven billion, five hundred eighty-one million, one hundred eighty-nine thousand, one hundred fifty-six".