77012666999645 has 16 divisors (see below), whose sum is σ = 99548165987760. Its totient is φ = 56857118828544.

The previous prime is 77012666999591. The next prime is 77012666999663. The reversal of 77012666999645 is 54699966621077.

It can be written as a sum of positive squares in 8 ways, for example, as 2229049 + 77012664770596 = 1493^2 + 8775686^2 .

It is a cyclic number.

It is not a de Polignac number, because 77012666999645 - 2⁶ = 77012666999581 is a prime.

It is a congruent number.

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, 143205854 + ... + 143742623.

It is an arithmetic number, because the mean of its divisors is an integer number (6221760374235).

Almost surely, 2^{77012666999645} is an apocalyptic number.

It is an amenable number.

77012666999645 is a deficient number, since it is larger than the sum of its proper divisors (22535498988115).

77012666999645 is a wasteful number, since it uses less digits than its factorization.

77012666999645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286952624.

The product of its (nonzero) digits is 1851776640, while the sum is 77.

The spelling of 77012666999645 in words is "seventy-seven trillion, twelve billion, six hundred sixty-six million, nine hundred ninety-nine thousand, six hundred forty-five".