1012661626523 has 4 divisors (see below), whose sum is σ = 1012677249720. Its totient is φ = 1012646003328.

The previous prime is 1012661626489. The next prime is 1012661626549. The reversal of 1012661626523 is 3256261662101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1012661626523 - 2¹⁶ = 1012661560987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012661622523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7713965 + ... + 7844142.

It is an arithmetic number, because the mean of its divisors is an integer number (253169312430).

Almost surely, 2^{1012661626523} is an apocalyptic number.

1012661626523 is a deficient number, since it is larger than the sum of its proper divisors (15623197).

1012661626523 is an equidigital number, since it uses as much as digits as its factorization.

1012661626523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15623196.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 1012661626523 in words is "one trillion, twelve billion, six hundred sixty-one million, six hundred twenty-six thousand, five hundred twenty-three".