245437166521 has 4 divisors (see below), whose sum is σ = 252070603492. Its totient is φ = 238803729552.

The previous prime is 245437166467. The next prime is 245437166551. The reversal of 245437166521 is 125661734542.

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 220303503225 + 25133663296 = 469365^2 + 158536^2 .

It is a cyclic number.

It is not a de Polignac number, because 245437166521 - 2¹¹ = 245437164473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245437166551) 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, 3316718430 + ... + 3316718503.

It is an arithmetic number, because the mean of its divisors is an integer number (63017650873).

Almost surely, 2^245437166521 is an apocalyptic number.

It is an amenable number.

245437166521 is a deficient number, since it is larger than the sum of its proper divisors (6633436971).

245437166521 is an equidigital number, since it uses as much as digits as its factorization.

245437166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633436970.

The product of its digits is 1209600, while the sum is 46.

The spelling of 245437166521 in words is "two hundred forty-five billion, four hundred thirty-seven million, one hundred sixty-six thousand, five hundred twenty-one".