77105721521450 has 48 divisors (see below), whose sum is σ = 150998390380320. Its totient is φ = 29212525609920.

The previous prime is 77105721521419. The next prime is 77105721521501. The reversal of 77105721521450 is 5412512750177.

It is a junction number, because it is equal to n+sod(n) for n = 77105721521395 and 77105721521404.

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 23 ways as a sum of consecutive naturals, for example, 4722557 + ... + 13285856.

It is an arithmetic number, because the mean of its divisors is an integer number (3145799799590).

Almost surely, 2^{77105721521450} is an apocalyptic number.

77105721521450 is a deficient number, since it is larger than the sum of its proper divisors (73892668858870).

77105721521450 is a wasteful number, since it uses less digits than its factorization.

77105721521450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18012951 (or 18012946 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 47.

The spelling of 77105721521450 in words is "seventy-seven trillion, one hundred five billion, seven hundred twenty-one million, five hundred twenty-one thousand, four hundred fifty".