4251561307620 has 96 divisors (see below), whose sum is σ = 12990528061056. Its totient is φ = 1030368768000.

The previous prime is 4251561307603. The next prime is 4251561307621. The reversal of 4251561307620 is 267031651524.

It is not an unprimeable number, because it can be changed into a prime (4251561307621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1202932 + ... + 3154388.

It is an arithmetic number, because the mean of its divisors is an integer number (135318000636).

Almost surely, 2^{4251561307620} is an apocalyptic number.

It is an amenable number.

4251561307620 is an abundant number, since it is smaller than the sum of its proper divisors (8738966753436).

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

4251561307620 is a wasteful number, since it uses less digits than its factorization.

4251561307620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954781 (or 1954779 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 4251561307620 in words is "four trillion, two hundred fifty-one billion, five hundred sixty-one million, three hundred seven thousand, six hundred twenty".