77721090453 has 12 divisors (see below), whose sum is σ = 112513833900. Its totient is φ = 51698658816.

The previous prime is 77721090449. The next prime is 77721090497. The reversal of 77721090453 is 35409012777.

It can be written as a sum of positive squares in 2 ways, for example, as 20208896964 + 57512193489 = 142158^2 + 239817^2 .

It is not a de Polignac number, because 77721090453 - 2² = 77721090449 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 77721090399 and 77721090408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77721090353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9612526 + ... + 9620607.

It is an arithmetic number, because the mean of its divisors is an integer number (9376152825).

Almost surely, 2^77721090453 is an apocalyptic number.

It is an amenable number.

77721090453 is a deficient number, since it is larger than the sum of its proper divisors (34792743447).

77721090453 is a wasteful number, since it uses less digits than its factorization.

77721090453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19233588 (or 19233585 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The spelling of 77721090453 in words is "seventy-seven billion, seven hundred twenty-one million, ninety thousand, four hundred fifty-three".