651561510551 has 4 divisors (see below), whose sum is σ = 744641726352. Its totient is φ = 558481294752.

The previous prime is 651561510517. The next prime is 651561510557. The reversal of 651561510551 is 155015165156.

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

It is a cyclic number.

It is not a de Polignac number, because 651561510551 - 2²⁶ = 651494401687 is a prime.

It is a super-3 number, since 3×651561510551³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651561510499 and 651561510508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651561510557) 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, 46540107890 + ... + 46540107903.

It is an arithmetic number, because the mean of its divisors is an integer number (186160431588).

Almost surely, 2^651561510551 is an apocalyptic number.

651561510551 is a deficient number, since it is larger than the sum of its proper divisors (93080215801).

651561510551 is an equidigital number, since it uses as much as digits as its factorization.

651561510551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93080215800.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 651561510551 in words is "six hundred fifty-one billion, five hundred sixty-one million, five hundred ten thousand, five hundred fifty-one".