6442371956 has 6 divisors (see below), whose sum is σ = 11274150930. Its totient is φ = 3221185976.

The previous prime is 6442371913. The next prime is 6442371959. The reversal of 6442371956 is 6591732446.

It can be written as a sum of positive squares in only one way, i.e., 5532384400 + 909987556 = 74380^2 + 30166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6442371956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442371959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805296491 + ... + 805296498.

It is an arithmetic number, because the mean of its divisors is an integer number (1879025155).

Almost surely, 2^6442371956 is an apocalyptic number.

It is an amenable number.

6442371956 is a deficient number, since it is larger than the sum of its proper divisors (4831778974).

6442371956 is a wasteful number, since it uses less digits than its factorization.

6442371956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610592993 (or 1610592991 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The square root of 6442371956 is about 80264.3878441741. The cubic root of 6442371956 is about 1860.7238824978.

The spelling of 6442371956 in words is "six billion, four hundred forty-two million, three hundred seventy-one thousand, nine hundred fifty-six".