20155474063557 has 32 divisors (see below), whose sum is σ = 34557640908800. Its totient is φ = 11371623694704.

The previous prime is 20155474063541. The next prime is 20155474063589. The reversal of 20155474063557 is 75536047455102.

It is a happy number.

20155474063557 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 5 + 47 + 40 + 6 + 3 + 557 = 666.

It is not a de Polignac number, because 20155474063557 - 2⁴ = 20155474063541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155474063537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 674938993 + ... + 674968854.

It is an arithmetic number, because the mean of its divisors is an integer number (1079926278400).

Almost surely, 2^{20155474063557} is an apocalyptic number.

20155474063557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20155474063557 is a deficient number, since it is larger than the sum of its proper divisors (14402166845243).

20155474063557 is a wasteful number, since it uses less digits than its factorization.

20155474063557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349907942 (or 1349907936 counting only the distinct ones).

The product of its (nonzero) digits is 17640000, while the sum is 54.

The spelling of 20155474063557 in words is "twenty trillion, one hundred fifty-five billion, four hundred seventy-four million, sixty-three thousand, five hundred fifty-seven".