1542221656 has 16 divisors (see below), whose sum is σ = 2904407640. Its totient is φ = 767712960.

The previous prime is 1542221651. The next prime is 1542221663. The reversal of 1542221656 is 6561222451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542221651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422805 + ... + 426436.

Almost surely, 2^1542221656 is an apocalyptic number.

It is an amenable number.

1542221656 is a deficient number, since it is larger than the sum of its proper divisors (1362185984).

1542221656 is a wasteful number, since it uses less digits than its factorization.

1542221656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849474 (or 849470 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 1542221656 is about 39271.1300575881. The cubic root of 1542221656 is about 1155.3554014581.

The spelling of 1542221656 in words is "one billion, five hundred forty-two million, two hundred twenty-one thousand, six hundred fifty-six".