77761152127805 has 16 divisors (see below), whose sum is σ = 94303224615600. Its totient is φ = 61549889049600.

The previous prime is 77761152127801. The next prime is 77761152127927. The reversal of 77761152127805 is 50872125116777.

It can be written as a sum of positive squares in 8 ways, for example, as 1717363072324 + 76043789055481 = 1310482^2 + 8720309^2 .

It is not a de Polignac number, because 77761152127805 - 2² = 77761152127801 is a prime.

It is a super-3 number, since 3×77761152127805³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77761152127801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53156060 + ... + 54599349.

It is an arithmetic number, because the mean of its divisors is an integer number (5893951538475).

Almost surely, 2^{77761152127805} is an apocalyptic number.

It is an amenable number.

77761152127805 is a deficient number, since it is larger than the sum of its proper divisors (16542072487795).

77761152127805 is a wasteful number, since it uses less digits than its factorization.

77761152127805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107756944.

The product of its (nonzero) digits is 11524800, while the sum is 59.

The spelling of 77761152127805 in words is "seventy-seven trillion, seven hundred sixty-one billion, one hundred fifty-two million, one hundred twenty-seven thousand, eight hundred five".