1225545051521 has 16 divisors (see below), whose sum is σ = 1433867111808. Its totient is φ = 1025818992000.

The previous prime is 1225545051457. The next prime is 1225545051583. The reversal of 1225545051521 is 1251505455221.

It is a cyclic number.

It is not a de Polignac number, because 1225545051521 - 2⁶ = 1225545051457 is a prime.

It is a super-2 number, since 2×1225545051521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225545081521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11821295 + ... + 11924516.

It is an arithmetic number, because the mean of its divisors is an integer number (89616694488).

Almost surely, 2^{1225545051521} is an apocalyptic number.

It is an amenable number.

1225545051521 is a deficient number, since it is larger than the sum of its proper divisors (208322060287).

1225545051521 is a wasteful number, since it uses less digits than its factorization.

1225545051521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23745992.

The product of its (nonzero) digits is 100000, while the sum is 38.

The spelling of 1225545051521 in words is "one trillion, two hundred twenty-five billion, five hundred forty-five million, fifty-one thousand, five hundred twenty-one".