521777772342 has 24 divisors (see below), whose sum is σ = 1190019481560. Its totient is φ = 164771928000.

The previous prime is 521777772331. The next prime is 521777772343. The reversal of 521777772342 is 243277777125.

521777772342 is a `hidden beast` number, since 521 + 7 + 7 + 7 + 7 + 72 + 3 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521777772343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 762832659 + ... + 762833342.

It is an arithmetic number, because the mean of its divisors is an integer number (49584145065).

Almost surely, 2^521777772342 is an apocalyptic number.

521777772342 is an abundant number, since it is smaller than the sum of its proper divisors (668241709218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521777772342 is a wasteful number, since it uses less digits than its factorization.

521777772342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525666028 (or 1525666025 counting only the distinct ones).

The product of its digits is 8067360, while the sum is 54.

The spelling of 521777772342 in words is "five hundred twenty-one billion, seven hundred seventy-seven million, seven hundred seventy-two thousand, three hundred forty-two".