77529540385 has 16 divisors (see below), whose sum is σ = 101499013440. Its totient is φ = 56381899840.

The previous prime is 77529540379. The next prime is 77529540419. The reversal of 77529540385 is 58304592577.

It is a de Polignac number, because none of the positive numbers 2^k-77529540385 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1387926 + ... + 1442704.

It is an arithmetic number, because the mean of its divisors is an integer number (6343688340).

Almost surely, 2^77529540385 is an apocalyptic number.

It is an amenable number.

77529540385 is a deficient number, since it is larger than the sum of its proper divisors (23969473055).

77529540385 is a wasteful number, since it uses less digits than its factorization.

77529540385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80528.

The product of its (nonzero) digits is 10584000, while the sum is 55.

The spelling of 77529540385 in words is "seventy-seven billion, five hundred twenty-nine million, five hundred forty thousand, three hundred eighty-five".