123278080621 has 2 divisors, whose sum is σ = 123278080622. Its totient is φ = 123278080620.

The previous prime is 123278080591. The next prime is 123278080643. The reversal of 123278080621 is 126080872321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79643048521 + 43635032100 = 282211^2 + 208890^2 .

It is a cyclic number.

It is not a de Polignac number, because 123278080621 - 2⁹ = 123278080109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123278080661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61639040310 + 61639040311.

It is an arithmetic number, because the mean of its divisors is an integer number (61639040311).

Almost surely, 2^123278080621 is an apocalyptic number.

It is an amenable number.

123278080621 is a deficient number, since it is larger than the sum of its proper divisors (1).

123278080621 is an equidigital number, since it uses as much as digits as its factorization.

123278080621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 123278080621 in words is "one hundred twenty-three billion, two hundred seventy-eight million, eighty thousand, six hundred twenty-one".