651545545157 has 4 divisors (see below), whose sum is σ = 701664433260. Its totient is φ = 601426657056.

The previous prime is 651545545153. The next prime is 651545545159. The reversal of 651545545157 is 751545545156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 147664201441 + 503881343716 = 384271^2 + 709846^2 .

It is a cyclic number.

It is not a de Polignac number, because 651545545157 - 2² = 651545545153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651545545099 and 651545545108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651545545153) 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, 25059444032 + ... + 25059444057.

It is an arithmetic number, because the mean of its divisors is an integer number (175416108315).

Almost surely, 2^651545545157 is an apocalyptic number.

It is an amenable number.

651545545157 is a deficient number, since it is larger than the sum of its proper divisors (50118888103).

651545545157 is a wasteful number, since it uses less digits than its factorization.

651545545157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50118888102.

The product of its digits is 10500000, while the sum is 53.

Subtracting 651545545157 from its reverse (751545545156), we obtain a palindrome (99999999999).

The spelling of 651545545157 in words is "six hundred fifty-one billion, five hundred forty-five million, five hundred forty-five thousand, one hundred fifty-seven".