1253450520442 has 4 divisors (see below), whose sum is σ = 1880175780666. Its totient is φ = 626725260220.

The previous prime is 1253450520419. The next prime is 1253450520449. The reversal of 1253450520442 is 2440250543521.

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

It can be written as a sum of positive squares in only one way, i.e., 684691706521 + 568758813921 = 827461^2 + 754161^2 .

It is a super-2 number, since 2×1253450520442² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1253450520449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313362630109 + ... + 313362630112.

Almost surely, 2^{1253450520442} is an apocalyptic number.

1253450520442 is a deficient number, since it is larger than the sum of its proper divisors (626725260224).

1253450520442 is an equidigital number, since it uses as much as digits as its factorization.

1253450520442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626725260223.

The product of its (nonzero) digits is 192000, while the sum is 37.

The spelling of 1253450520442 in words is "one trillion, two hundred fifty-three billion, four hundred fifty million, five hundred twenty thousand, four hundred forty-two".