651291749987 has 4 divisors (see below), whose sum is σ = 689603029416. Its totient is φ = 612980470560.

The previous prime is 651291749939. The next prime is 651291750001. The reversal of 651291749987 is 789947192156.

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 651291749987 - 2²² = 651287555683 is a prime.

It is a super-2 number, since 2×651291749987² (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 (651291749917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19155639689 + ... + 19155639722.

It is an arithmetic number, because the mean of its divisors is an integer number (172400757354).

Almost surely, 2^651291749987 is an apocalyptic number.

651291749987 is a deficient number, since it is larger than the sum of its proper divisors (38311279429).

651291749987 is a wasteful number, since it uses less digits than its factorization.

651291749987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38311279428.

The product of its digits is 68584320, while the sum is 68.

The spelling of 651291749987 in words is "six hundred fifty-one billion, two hundred ninety-one million, seven hundred forty-nine thousand, nine hundred eighty-seven".