245554501151021 has 4 divisors (see below), whose sum is σ = 245699200328412. Its totient is φ = 245409801973632.

The previous prime is 245554501150993. The next prime is 245554501151051. The reversal of 245554501151021 is 120151105455542.

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 174313558161796 + 71240942989225 = 13202786^2 + 8440435^2 .

It is a cyclic number.

It is not a de Polignac number, because 245554501151021 - 2³⁰ = 245553427409197 is a prime.

It is a super-2 number, since 2×245554501151021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245554501151021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245554501151051) 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, 72349586150 + ... + 72349589543.

It is an arithmetic number, because the mean of its divisors is an integer number (61424800082103).

Almost surely, 2^{245554501151021} is an apocalyptic number.

It is an amenable number.

245554501151021 is a deficient number, since it is larger than the sum of its proper divisors (144699177391).

245554501151021 is a wasteful number, since it uses less digits than its factorization.

245554501151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144699177390.

The product of its (nonzero) digits is 200000, while the sum is 41.

The spelling of 245554501151021 in words is "two hundred forty-five trillion, five hundred fifty-four billion, five hundred one million, one hundred fifty-one thousand, twenty-one".