20155424351345 has 64 divisors (see below), whose sum is σ = 26169544238400. Its totient is φ = 14869846978560.

The previous prime is 20155424351323. The next prime is 20155424351351. The reversal of 20155424351345 is 54315342455102.

It is a happy number.

It can be written as a sum of positive squares in 32 ways, for example, as 9408593079649 + 10746831271696 = 3067343^2 + 3278236^2 .

It is not a de Polignac number, because 20155424351345 - 2¹⁶ = 20155424285809 is a prime.

It is a super-2 number, since 2×20155424351345² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20155424351296 and 20155424351305.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166517387 + ... + 166638383.

It is an arithmetic number, because the mean of its divisors is an integer number (408899128725).

Almost surely, 2^{20155424351345} is an apocalyptic number.

It is an amenable number.

20155424351345 is a deficient number, since it is larger than the sum of its proper divisors (6014119887055).

20155424351345 is a wasteful number, since it uses less digits than its factorization.

20155424351345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121638.

The product of its (nonzero) digits is 1440000, while the sum is 44.

The spelling of 20155424351345 in words is "twenty trillion, one hundred fifty-five billion, four hundred twenty-four million, three hundred fifty-one thousand, three hundred forty-five".