77923011281 has 16 divisors (see below), whose sum is σ = 81145204800. Its totient is φ = 74737857600.

The previous prime is 77923011269. The next prime is 77923011289. The reversal of 77923011281 is 18211032977.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 77923011281 - 2¹⁰ = 77923010257 is a prime.

It is a super-2 number, since 2×77923011281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77923011289) 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, 3298610 + ... + 3322148.

It is an arithmetic number, because the mean of its divisors is an integer number (5071575300).

Almost surely, 2^77923011281 is an apocalyptic number.

It is an amenable number.

77923011281 is a deficient number, since it is larger than the sum of its proper divisors (3222193519).

77923011281 is a wasteful number, since it uses less digits than its factorization.

77923011281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24320.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 77923011281 in words is "seventy-seven billion, nine hundred twenty-three million, eleven thousand, two hundred eighty-one".