651161645642 has 8 divisors (see below), whose sum is σ = 977793862500. Its totient is φ = 325230358144.

The previous prime is 651161645627. The next prime is 651161645657. The reversal of 651161645642 is 246546161156.

It is an interprime number because it is at equal distance from previous prime (651161645627) and next prime (651161645657).

It can be written as a sum of positive squares in 2 ways, for example, as 525640950121 + 125520695521 = 725011^2 + 354289^2 .

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

It is a super-2 number, since 2×651161645642² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175230017 + ... + 175233732.

Almost surely, 2^651161645642 is an apocalyptic number.

651161645642 is a deficient number, since it is larger than the sum of its proper divisors (326632216858).

651161645642 is a wasteful number, since it uses less digits than its factorization.

651161645642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350464680.

The product of its digits is 1036800, while the sum is 47.

The spelling of 651161645642 in words is "six hundred fifty-one billion, one hundred sixty-one million, six hundred forty-five thousand, six hundred forty-two".