20251235562501 has 4 divisors (see below), whose sum is σ = 27001647416672. Its totient is φ = 13500823708332.

The previous prime is 20251235562487. The next prime is 20251235562511. The reversal of 20251235562501 is 10526553215202.

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 not a de Polignac number, because 20251235562501 - 2⁵ = 20251235562469 is a prime.

It is a super-2 number, since 2×20251235562501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20251235562501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251235562511) 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, 3375205927081 + ... + 3375205927086.

It is an arithmetic number, because the mean of its divisors is an integer number (6750411854168).

Almost surely, 2^{20251235562501} is an apocalyptic number.

It is an amenable number.

20251235562501 is a deficient number, since it is larger than the sum of its proper divisors (6750411854171).

20251235562501 is an equidigital number, since it uses as much as digits as its factorization.

20251235562501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750411854170.

The product of its (nonzero) digits is 180000, while the sum is 39.

Adding to 20251235562501 its reverse (10526553215202), we get a palindrome (30777788777703).

The spelling of 20251235562501 in words is "twenty trillion, two hundred fifty-one billion, two hundred thirty-five million, five hundred sixty-two thousand, five hundred one".