651966540 has 48 divisors (see below), whose sum is σ = 1827958272. Its totient is φ = 173624256.

The previous prime is 651966503. The next prime is 651966547. The reversal of 651966540 is 45669156.

It is a junction number, because it is equal to n+sod(n) for n = 651966492 and 651966501.

It is not an unprimeable number, because it can be changed into a prime (651966547) 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, 40317 + ... + 54123.

It is an arithmetic number, because the mean of its divisors is an integer number (38082464).

Almost surely, 2^651966540 is an apocalyptic number.

651966540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651966540 is an abundant number, since it is smaller than the sum of its proper divisors (1175991732).

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

651966540 is a wasteful number, since it uses less digits than its factorization.

651966540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14606 (or 14604 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 651966540 is about 25533.6354638348. The cubic root of 651966540 is about 867.1118124122. Note that the first 3 decimals are identical.

The spelling of 651966540 in words is "six hundred fifty-one million, nine hundred sixty-six thousand, five hundred forty".