77661390145 has 16 divisors (see below), whose sum is σ = 93768192000. Its totient is φ = 61747123648.

The previous prime is 77661390133. The next prime is 77661390161. The reversal of 77661390145 is 54109316677.

It is a cyclic number.

It is not a de Polignac number, because 77661390145 - 2⁷ = 77661390017 is a prime.

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, 544416 + ... + 672094.

It is an arithmetic number, because the mean of its divisors is an integer number (5860512000).

Almost surely, 2^77661390145 is an apocalyptic number.

It is an amenable number.

77661390145 is a deficient number, since it is larger than the sum of its proper divisors (16106801855).

77661390145 is a wasteful number, since it uses less digits than its factorization.

77661390145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128432.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 77661390145 in words is "seventy-seven billion, six hundred sixty-one million, three hundred ninety thousand, one hundred forty-five".