245244134155551 has 4 divisors (see below), whose sum is σ = 326992178874072. Its totient is φ = 163496089437032.

The previous prime is 245244134155523. The next prime is 245244134155567. The reversal of 245244134155551 is 155551431442542.

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 245244134155551 - 2⁵ = 245244134155519 is a prime.

It is a super-2 number, since 2×245244134155551² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 245244134155494 and 245244134155503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245244134155451) 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, 40874022359256 + ... + 40874022359261.

It is an arithmetic number, because the mean of its divisors is an integer number (81748044718518).

Almost surely, 2^{245244134155551} is an apocalyptic number.

245244134155551 is a deficient number, since it is larger than the sum of its proper divisors (81748044718521).

245244134155551 is an equidigital number, since it uses as much as digits as its factorization.

245244134155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81748044718520.

The product of its digits is 9600000, while the sum is 51.

The spelling of 245244134155551 in words is "two hundred forty-five trillion, two hundred forty-four billion, one hundred thirty-four million, one hundred fifty-five thousand, five hundred fifty-one".