245554511551021 has 4 divisors (see below), whose sum is σ = 259998894583452. Its totient is φ = 231110128518592.

The previous prime is 245554511550883. The next prime is 245554511551049. The reversal of 245554511551021 is 120155115455542.

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 164008644975396 + 81545866575625 = 12806586^2 + 9030275^2 .

It is a cyclic number.

It is not a de Polignac number, because 245554511551021 - 2¹³ = 245554511542829 is a prime.

It is a super-2 number, since 2×245554511551021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245554511551051) 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, 7222191516190 + ... + 7222191516223.

It is an arithmetic number, because the mean of its divisors is an integer number (64999723645863).

Almost surely, 2^{245554511551021} is an apocalyptic number.

It is an amenable number.

245554511551021 is a deficient number, since it is larger than the sum of its proper divisors (14444383032431).

245554511551021 is a wasteful number, since it uses less digits than its factorization.

245554511551021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14444383032430.

The product of its (nonzero) digits is 1000000, while the sum is 46.

The spelling of 245554511551021 in words is "two hundred forty-five trillion, five hundred fifty-four billion, five hundred eleven million, five hundred fifty-one thousand, twenty-one".