651244131557 has 4 divisors (see below), whose sum is σ = 651287011500. Its totient is φ = 651201251616.

The previous prime is 651244131529. The next prime is 651244131563. The reversal of 651244131557 is 755131442156.

It is a happy number.

651244131557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 354960957796 + 296283173761 = 595786^2 + 544319^2 .

It is a cyclic number.

It is not a de Polignac number, because 651244131557 - 2¹⁰ = 651244130533 is a prime.

It is a super-2 number, since 2×651244131557² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651244130557) 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, 21417182 + ... + 21447567.

It is an arithmetic number, because the mean of its divisors is an integer number (162821752875).

Almost surely, 2^651244131557 is an apocalyptic number.

It is an amenable number.

651244131557 is a deficient number, since it is larger than the sum of its proper divisors (42879943).

651244131557 is a wasteful number, since it uses less digits than its factorization.

651244131557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42879942.

The product of its digits is 504000, while the sum is 44.

The spelling of 651244131557 in words is "six hundred fifty-one billion, two hundred forty-four million, one hundred thirty-one thousand, five hundred fifty-seven".