77148667148661 has 64 divisors (see below), whose sum is σ = 123506233036800. Its totient is φ = 47441666884608.

The previous prime is 77148667148653. The next prime is 77148667148711. The reversal of 77148667148661 is 16684176684177.

77148667148661 is a `hidden beast` number, since 7 + 7 + 1 + 4 + 86 + 6 + 7 + 1 + 486 + 61 = 666.

It is not a de Polignac number, because 77148667148661 - 2³ = 77148667148653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77148667148661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77148667198661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3636031 + ... + 12942876.

It is an arithmetic number, because the mean of its divisors is an integer number (1929784891200).

Almost surely, 2^{77148667148661} is an apocalyptic number.

It is an amenable number.

77148667148661 is a deficient number, since it is larger than the sum of its proper divisors (46357565888139).

77148667148661 is a wasteful number, since it uses less digits than its factorization.

77148667148661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16579175 (or 16579169 counting only the distinct ones).

The product of its digits is 455196672, while the sum is 72.

The spelling of 77148667148661 in words is "seventy-seven trillion, one hundred forty-eight billion, six hundred sixty-seven million, one hundred forty-eight thousand, six hundred sixty-one".