20051152607551 has 4 divisors (see below), whose sum is σ = 21593548961992. Its totient is φ = 18508756253112.

The previous prime is 20051152607513. The next prime is 20051152607587. The reversal of 20051152607551 is 15570625115002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20051152607551 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 (20051152607501) 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, 771198177201 + ... + 771198177226.

It is an arithmetic number, because the mean of its divisors is an integer number (5398387240498).

Almost surely, 2^{20051152607551} is an apocalyptic number.

20051152607551 is a deficient number, since it is larger than the sum of its proper divisors (1542396354441).

20051152607551 is a wasteful number, since it uses less digits than its factorization.

20051152607551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542396354440.

The product of its (nonzero) digits is 105000, while the sum is 40.

The spelling of 20051152607551 in words is "twenty trillion, fifty-one billion, one hundred fifty-two million, six hundred seven thousand, five hundred fifty-one".