1220123256148 has 12 divisors (see below), whose sum is σ = 2260816621812. Its totient is φ = 574175649920.

The previous prime is 1220123256137. The next prime is 1220123256203. The reversal of 1220123256148 is 8416523210221.

It can be written as a sum of positive squares in 2 ways, for example, as 453451398544 + 766671857604 = 673388^2 + 875598^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971494463 + ... + 8971494598.

It is an arithmetic number, because the mean of its divisors is an integer number (188401385151).

Almost surely, 2^{1220123256148} is an apocalyptic number.

It is an amenable number.

1220123256148 is a deficient number, since it is larger than the sum of its proper divisors (1040693365664).

1220123256148 is a wasteful number, since it uses less digits than its factorization.

1220123256148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17942989082 (or 17942989080 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 1220123256148 its reverse (8416523210221), we get a palindrome (9636646466369).

The spelling of 1220123256148 in words is "one trillion, two hundred twenty billion, one hundred twenty-three million, two hundred fifty-six thousand, one hundred forty-eight".