77921012123 has 8 divisors (see below), whose sum is σ = 79820691456. Its totient is φ = 76025313000.

The previous prime is 77921012111. The next prime is 77921012171. The reversal of 77921012123 is 32121012977.

It is a happy number.

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 77921012123 - 2¹⁴ = 77920995739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77921012723) 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, 955403 + ... + 1033748.

It is an arithmetic number, because the mean of its divisors is an integer number (9977586432).

Almost surely, 2^77921012123 is an apocalyptic number.

77921012123 is a deficient number, since it is larger than the sum of its proper divisors (1899679333).

77921012123 is a wasteful number, since it uses less digits than its factorization.

77921012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990105.

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 77921012123 in words is "seventy-seven billion, nine hundred twenty-one million, twelve thousand, one hundred twenty-three".