651604493040 has 40 divisors (see below), whose sum is σ = 2019973929168. Its totient is φ = 173761198080.

The previous prime is 651604493039. The next prime is 651604493047. The reversal of 651604493040 is 40394406156.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×651604493040³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 651604492983 and 651604493001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651604493047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357509121 + ... + 1357509600.

Almost surely, 2^651604493040 is an apocalyptic number.

651604493040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651604493040 is an abundant number, since it is smaller than the sum of its proper divisors (1368369436128).

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

651604493040 is a wasteful number, since it uses less digits than its factorization.

651604493040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715018737 (or 2715018731 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 651604493040 its reverse (40394406156), we get a palindrome (691998899196).

The spelling of 651604493040 in words is "six hundred fifty-one billion, six hundred four million, four hundred ninety-three thousand, forty".