651121536361 has 4 divisors (see below), whose sum is σ = 651334254724. Its totient is φ = 650908818000.

The previous prime is 651121536347. The next prime is 651121536389. The reversal of 651121536361 is 163635121156.

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 582382659600 + 68738876761 = 763140^2 + 262181^2 .

It is a cyclic number.

It is not a de Polignac number, because 651121536361 - 2³⁹ = 101365722473 is a prime.

It is a super-2 number, since 2×651121536361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651121536311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106354590 + ... + 106360711.

It is an arithmetic number, because the mean of its divisors is an integer number (162833563681).

Almost surely, 2^651121536361 is an apocalyptic number.

It is an amenable number.

651121536361 is a deficient number, since it is larger than the sum of its proper divisors (212718363).

651121536361 is a wasteful number, since it uses less digits than its factorization.

651121536361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212718362.

The product of its digits is 97200, while the sum is 40.

The spelling of 651121536361 in words is "six hundred fifty-one billion, one hundred twenty-one million, five hundred thirty-six thousand, three hundred sixty-one".