651689986157 has 16 divisors (see below), whose sum is σ = 749117258112. Its totient is φ = 555353210880.

The previous prime is 651689986099. The next prime is 651689986159. The reversal of 651689986157 is 751689986156.

It is a cyclic number.

It is not a de Polignac number, because 651689986157 - 2⁶ = 651689986093 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 (651689986159) 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 15 ways as a sum of consecutive naturals, for example, 594557 + ... + 1287197.

It is an arithmetic number, because the mean of its divisors is an integer number (46819828632).

Almost surely, 2^651689986157 is an apocalyptic number.

It is an amenable number.

651689986157 is a deficient number, since it is larger than the sum of its proper divisors (97427271955).

651689986157 is a wasteful number, since it uses less digits than its factorization.

651689986157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693428.

The product of its digits is 195955200, while the sum is 71.

Subtracting 651689986157 from its reverse (751689986156), we obtain a palindrome (99999999999).

The spelling of 651689986157 in words is "six hundred fifty-one billion, six hundred eighty-nine million, nine hundred eighty-six thousand, one hundred fifty-seven".