77745464016121 has 6 divisors (see below), whose sum is σ = 85455757968266. Its totient is φ = 70677694560000.

The previous prime is 77745464016119. The next prime is 77745464016151. The reversal of 77745464016121 is 12161046454777.

It can be written as a sum of positive squares in only one way, i.e., 63159259398400 + 14586204617721 = 7947280^2 + 3819189^2 .

It is not a de Polignac number, because 77745464016121 - 2¹ = 77745464016119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77745464016151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321262247880 + ... + 321262248121.

Almost surely, 2^{77745464016121} is an apocalyptic number.

It is an amenable number.

77745464016121 is a deficient number, since it is larger than the sum of its proper divisors (7710293952145).

77745464016121 is a wasteful number, since it uses less digits than its factorization.

77745464016121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642524496023 (or 642524496012 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 55.

The spelling of 77745464016121 in words is "seventy-seven trillion, seven hundred forty-five billion, four hundred sixty-four million, sixteen thousand, one hundred twenty-one".