77893530881 has 4 divisors (see below), whose sum is σ = 78019777092. Its totient is φ = 77767284672.

The previous prime is 77893530811. The next prime is 77893530893. The reversal of 77893530881 is 18803539877.

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 21099015025 + 56794515856 = 145255^2 + 238316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77893530881 is a prime.

It is a super-2 number, since 2×77893530881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77893530881.

It is not an unprimeable number, because it can be changed into a prime (77893530811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63122180 + ... + 63123413.

It is an arithmetic number, because the mean of its divisors is an integer number (19504944273).

Almost surely, 2^77893530881 is an apocalyptic number.

It is an amenable number.

77893530881 is a deficient number, since it is larger than the sum of its proper divisors (126246211).

77893530881 is a wasteful number, since it uses less digits than its factorization.

77893530881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126246210.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 77893530881 in words is "seventy-seven billion, eight hundred ninety-three million, five hundred thirty thousand, eight hundred eighty-one".