77761408780045 has 4 divisors (see below), whose sum is σ = 93313690536060. Its totient is φ = 62209127024032.

The previous prime is 77761408780037. The next prime is 77761408780051. The reversal of 77761408780045 is 54008780416777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34682900429961 + 43078508350084 = 5889219^2 + 6563422^2 .

It is a cyclic number.

It is not a de Polignac number, because 77761408780045 - 2³ = 77761408780037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7776140878000 + ... + 7776140878009.

It is an arithmetic number, because the mean of its divisors is an integer number (23328422634015).

Almost surely, 2^{77761408780045} is an apocalyptic number.

It is an amenable number.

77761408780045 is a deficient number, since it is larger than the sum of its proper divisors (15552281756015).

77761408780045 is a wasteful number, since it uses less digits than its factorization.

77761408780045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15552281756014.

The product of its (nonzero) digits is 73758720, while the sum is 64.

The spelling of 77761408780045 in words is "seventy-seven trillion, seven hundred sixty-one billion, four hundred eight million, seven hundred eighty thousand, forty-five".