651566530340461 has 8 divisors (see below), whose sum is σ = 654308215863480. Its totient is φ = 648826444873728.

The previous prime is 651566530340449. The next prime is 651566530340477. The reversal of 651566530340461 is 164043035665156.

It can be written as a sum of positive squares in 4 ways, for example, as 255408022620100 + 396158507720361 = 15981490^2 + 19903731^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 651566530340461 - 2¹³ = 651566530332269 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 (651566530343461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399197926 + ... + 400826791.

It is an arithmetic number, because the mean of its divisors is an integer number (81788526982935).

Almost surely, 2^{651566530340461} is an apocalyptic number.

It is an amenable number.

651566530340461 is a deficient number, since it is larger than the sum of its proper divisors (2741685523019).

651566530340461 is a wasteful number, since it uses less digits than its factorization.

651566530340461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800028143.

The product of its (nonzero) digits is 23328000, while the sum is 55.

The spelling of 651566530340461 in words is "six hundred fifty-one trillion, five hundred sixty-six billion, five hundred thirty million, three hundred forty thousand, four hundred sixty-one".