1245450656191 has 4 divisors (see below), whose sum is σ = 1423372178512. Its totient is φ = 1067529133872.

The previous prime is 1245450656173. The next prime is 1245450656249. The reversal of 1245450656191 is 1916560545421.

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 1245450656191 - 2⁹ = 1245450655679 is a prime.

It is a super-2 number, since 2×1245450656191² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245450656291) 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, 88960761150 + ... + 88960761163.

It is an arithmetic number, because the mean of its divisors is an integer number (355843044628).

Almost surely, 2^{1245450656191} is an apocalyptic number.

1245450656191 is a deficient number, since it is larger than the sum of its proper divisors (177921522321).

1245450656191 is an equidigital number, since it uses as much as digits as its factorization.

1245450656191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177921522320.

The product of its (nonzero) digits is 1296000, while the sum is 49.

It can be divided in two parts, 1245450 and 656191, that added together give a square (1901641 = 1379²).

The spelling of 1245450656191 in words is "one trillion, two hundred forty-five billion, four hundred fifty million, six hundred fifty-six thousand, one hundred ninety-one".