1012120155553 has 4 divisors (see below), whose sum is σ = 1089975552148. Its totient is φ = 934264758960.

The previous prime is 1012120155481. The next prime is 1012120155583. The reversal of 1012120155553 is 3555510212101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 302403207744 + 709716947809 = 549912^2 + 842447^2 .

It is not a de Polignac number, because 1012120155553 - 2³⁷ = 874681202081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012120155583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38927698278 + ... + 38927698303.

It is an arithmetic number, because the mean of its divisors is an integer number (272493888037).

Almost surely, 2^{1012120155553} is an apocalyptic number.

1012120155553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1012120155553 is a deficient number, since it is larger than the sum of its proper divisors (77855396595).

1012120155553 is an equidigital number, since it uses as much as digits as its factorization.

1012120155553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77855396594.

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 1012120155553 its reverse (3555510212101), we get a palindrome (4567630367654).

The spelling of 1012120155553 in words is "one trillion, twelve billion, one hundred twenty million, one hundred fifty-five thousand, five hundred fifty-three".