245605556621 has 16 divisors (see below), whose sum is σ = 254887257600. Its totient is φ = 236411697600.

The previous prime is 245605556597. The next prime is 245605556641. The reversal of 245605556621 is 126655506542.

It is a cyclic number.

It is not a de Polignac number, because 245605556621 - 2¹⁸ = 245605294477 is a prime.

It is a super-2 number, since 2×245605556621² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245605556641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5138051 + ... + 5185631.

It is an arithmetic number, because the mean of its divisors is an integer number (15930453600).

Almost surely, 2^245605556621 is an apocalyptic number.

It is an amenable number.

245605556621 is a deficient number, since it is larger than the sum of its proper divisors (9281700979).

245605556621 is a wasteful number, since it uses less digits than its factorization.

245605556621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48500.

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 245605556621 in words is "two hundred forty-five billion, six hundred five million, five hundred fifty-six thousand, six hundred twenty-one".