77121253042 has 32 divisors (see below), whose sum is σ = 122212177920. Its totient is φ = 36398793600.

The previous prime is 77121253039. The next prime is 77121253087. The reversal of 77121253042 is 24035212177.

It is a junction number, because it is equal to n+sod(n) for n = 77121252989 and 77121253007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18932718 + ... + 18936790.

It is an arithmetic number, because the mean of its divisors is an integer number (3819130560).

Almost surely, 2^77121253042 is an apocalyptic number.

77121253042 is a deficient number, since it is larger than the sum of its proper divisors (45090924878).

77121253042 is a wasteful number, since it uses less digits than its factorization.

77121253042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 77121253042 in words is "seventy-seven billion, one hundred twenty-one million, two hundred fifty-three thousand, forty-two".