77761378237018 has 32 divisors (see below), whose sum is σ = 139127714002944. Its totient is φ = 31871235897072.

The previous prime is 77761378236989. The next prime is 77761378237033. The reversal of 77761378237018 is 81073287316777.

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, 21417630 + ... + 24783817.

It is an arithmetic number, because the mean of its divisors is an integer number (4347741062592).

Almost surely, 2^{77761378237018} is an apocalyptic number.

77761378237018 is a deficient number, since it is larger than the sum of its proper divisors (61366335765926).

77761378237018 is a wasteful number, since it uses less digits than its factorization.

77761378237018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46206706.

The product of its (nonzero) digits is 116169984, while the sum is 67.

The spelling of 77761378237018 in words is "seventy-seven trillion, seven hundred sixty-one billion, three hundred seventy-eight million, two hundred thirty-seven thousand, eighteen".