651256403642 has 16 divisors (see below), whose sum is σ = 1053162046440. Its totient is φ = 300256315392.

The previous prime is 651256403591. The next prime is 651256403657. The reversal of 651256403642 is 246304652156.

It is a happy number.

651256403642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 268366477681 + 382889925961 = 518041^2 + 618781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 651256403593 and 651256403602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13457183 + ... + 13505490.

Almost surely, 2^651256403642 is an apocalyptic number.

651256403642 is a deficient number, since it is larger than the sum of its proper divisors (401905642798).

651256403642 is a wasteful number, since it uses less digits than its factorization.

651256403642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26963617.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 651256403642 in words is "six hundred fifty-one billion, two hundred fifty-six million, four hundred three thousand, six hundred forty-two".