20251145631653 has 4 divisors (see below), whose sum is σ = 21316995401760. Its totient is φ = 19185295861548.

The previous prime is 20251145631623. The next prime is 20251145631659. The reversal of 20251145631653 is 35613654115202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20251145631653 - 2¹⁰ = 20251145630629 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 (20251145631659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532924885025 + ... + 532924885062.

It is an arithmetic number, because the mean of its divisors is an integer number (5329248850440).

Almost surely, 2^{20251145631653} is an apocalyptic number.

It is an amenable number.

20251145631653 is a deficient number, since it is larger than the sum of its proper divisors (1065849770107).

20251145631653 is a wasteful number, since it uses less digits than its factorization.

20251145631653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065849770106.

The product of its (nonzero) digits is 648000, while the sum is 44.

Adding to 20251145631653 its reverse (35613654115202), we get a palindrome (55864799746855).

The spelling of 20251145631653 in words is "twenty trillion, two hundred fifty-one billion, one hundred forty-five million, six hundred thirty-one thousand, six hundred fifty-three".