77053890821 has 8 divisors (see below), whose sum is σ = 81768187800. Its totient is φ = 72359784448.

The previous prime is 77053890779. The next prime is 77053890827. The reversal of 77053890821 is 12809835077.

It can be written as a sum of positive squares in 4 ways, for example, as 9084186721 + 67969704100 = 95311^2 + 260710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77053890821 - 2²² = 77049696517 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77053890821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77053890827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5039786 + ... + 5055051.

It is an arithmetic number, because the mean of its divisors is an integer number (10221023475).

Almost surely, 2^77053890821 is an apocalyptic number.

It is an amenable number.

77053890821 is a deficient number, since it is larger than the sum of its proper divisors (4714296979).

77053890821 is a wasteful number, since it uses less digits than its factorization.

77053890821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10095303.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 77053890821 in words is "seventy-seven billion, fifty-three million, eight hundred ninety thousand, eight hundred twenty-one".