20351655542251 has 16 divisors (see below), whose sum is σ = 22219157773440. Its totient is φ = 18487050785280.

The previous prime is 20351655542249. The next prime is 20351655542261. The reversal of 20351655542251 is 15224555615302.

It is not a de Polignac number, because 20351655542251 - 2¹ = 20351655542249 is a prime.

It is a super-2 number, since 2×20351655542251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20351655542261) 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, 75055420 + ... + 75326086.

It is an arithmetic number, because the mean of its divisors is an integer number (1388697360840).

Almost surely, 2^{20351655542251} is an apocalyptic number.

20351655542251 is a deficient number, since it is larger than the sum of its proper divisors (1867502231189).

20351655542251 is a wasteful number, since it uses less digits than its factorization.

20351655542251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275994.

The product of its (nonzero) digits is 1800000, while the sum is 46.

The spelling of 20351655542251 in words is "twenty trillion, three hundred fifty-one billion, six hundred fifty-five million, five hundred forty-two thousand, two hundred fifty-one".