77720615122 has 4 divisors (see below), whose sum is σ = 116580922686. Its totient is φ = 38860307560.

The previous prime is 77720615083. The next prime is 77720615149. The reversal of 77720615122 is 22151602777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75487013001 + 2233602121 = 274749^2 + 47261^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19430153779 + ... + 19430153782.

Almost surely, 2^77720615122 is an apocalyptic number.

77720615122 is a deficient number, since it is larger than the sum of its proper divisors (38860307564).

77720615122 is a wasteful number, since it uses less digits than its factorization.

77720615122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38860307563.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 77720615122 in words is "seventy-seven billion, seven hundred twenty million, six hundred fifteen thousand, one hundred twenty-two".