77424747550 has 24 divisors (see below), whose sum is σ = 144051373872. Its totient is φ = 30961008000.

The previous prime is 77424747511. The next prime is 77424747551. The reversal of 77424747550 is 5574742477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77424747551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44971 + ... + 396070.

It is an arithmetic number, because the mean of its divisors is an integer number (6002140578).

Almost surely, 2^77424747550 is an apocalyptic number.

77424747550 is a deficient number, since it is larger than the sum of its proper divisors (66626626322).

77424747550 is a wasteful number, since it uses less digits than its factorization.

77424747550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444564 (or 444559 counting only the distinct ones).

The product of its (nonzero) digits is 7683200, while the sum is 52.

The spelling of 77424747550 in words is "seventy-seven billion, four hundred twenty-four million, seven hundred forty-seven thousand, five hundred fifty".