2251066731506 has 16 divisors (see below), whose sum is σ = 3427152655680. Its totient is φ = 1108684038000.

The previous prime is 2251066731503. The next prime is 2251066731517. The reversal of 2251066731506 is 6051376601522.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2251066731503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2673131 + ... + 3412881.

It is an arithmetic number, because the mean of its divisors is an integer number (214197040980).

Almost surely, 2^{2251066731506} is an apocalyptic number.

2251066731506 is a deficient number, since it is larger than the sum of its proper divisors (1176085924174).

2251066731506 is a wasteful number, since it uses less digits than its factorization.

2251066731506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762529.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 2251066731506 in words is "two trillion, two hundred fifty-one billion, sixty-six million, seven hundred thirty-one thousand, five hundred six".