77775074542 has 16 divisors (see below), whose sum is σ = 129354671664. Its totient is φ = 34772760000.

The previous prime is 77775074491. The next prime is 77775074549. The reversal of 77775074542 is 24547057777.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77775074549) 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 7 ways as a sum of consecutive naturals, for example, 28975959 + ... + 28978642.

It is an arithmetic number, because the mean of its divisors is an integer number (8084666979).

Almost surely, 2^77775074542 is an apocalyptic number.

77775074542 is a deficient number, since it is larger than the sum of its proper divisors (51579597122).

77775074542 is a wasteful number, since it uses less digits than its factorization.

77775074542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57954675.

The product of its (nonzero) digits is 13445600, while the sum is 55.

The spelling of 77775074542 in words is "seventy-seven billion, seven hundred seventy-five million, seventy-four thousand, five hundred forty-two".