651866512 has 80 divisors (see below), whose sum is σ = 1433193984. Its totient is φ = 284544000.

The previous prime is 651866473. The next prime is 651866519. The reversal of 651866512 is 215668156.

It is a super-2 number, since 2×651866512² = 849859898934092288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (651866519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856212 + ... + 856972.

Almost surely, 2^651866512 is an apocalyptic number.

651866512 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651866512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (716596992).

651866512 is an abundant number, since it is smaller than the sum of its proper divisors (781327472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651866512 is a wasteful number, since it uses less digits than its factorization.

651866512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 962 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 651866512 is about 25531.6766390302. The cubic root of 651866512 is about 867.0674645859.

The spelling of 651866512 in words is "six hundred fifty-one million, eight hundred sixty-six thousand, five hundred twelve".