1651131630720 has 640 divisors, whose sum is σ = 6927375026880. Its totient is φ = 369482342400.

The previous prime is 1651131630683. The next prime is 1651131630721. The reversal of 1651131630720 is 270361311561.

1651131630720 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 13 + 1 + 630 + 7 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1651131630721) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7301755 + ... + 7524485.

Almost surely, 2^{1651131630720} is an apocalyptic number.

1651131630720 is a gapful number since it is divisible by the number (10) 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 1651131630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463687513440).

1651131630720 is an abundant number, since it is smaller than the sum of its proper divisors (5276243396160).

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

1651131630720 is a wasteful number, since it uses less digits than its factorization.

1651131630720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222786 (or 222765 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 1651131630720 in words is "one trillion, six hundred fifty-one billion, one hundred thirty-one million, six hundred thirty thousand, seven hundred twenty".