42591037556 has 6 divisors (see below), whose sum is σ = 74534315730. Its totient is φ = 21295518776.

The previous prime is 42591037553. The next prime is 42591037597. The reversal of 42591037556 is 65573019524.

It can be written as a sum of positive squares in only one way, i.e., 42493699600 + 97337956 = 206140^2 + 9866^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42591037556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42591037553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5323879691 + ... + 5323879698.

It is an arithmetic number, because the mean of its divisors is an integer number (12422385955).

Almost surely, 2^42591037556 is an apocalyptic number.

It is an amenable number.

42591037556 is a deficient number, since it is larger than the sum of its proper divisors (31943278174).

42591037556 is a wasteful number, since it uses less digits than its factorization.

42591037556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10647759393 (or 10647759391 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 42591037556 in words is "forty-two billion, five hundred ninety-one million, thirty-seven thousand, five hundred fifty-six".