1530721232655 has 64 divisors (see below), whose sum is σ = 2517804656640. Its totient is φ = 793746607104.

The previous prime is 1530721232653. The next prime is 1530721232683. The reversal of 1530721232655 is 5562321270351.

It is a happy number.

It is not a de Polignac number, because 1530721232655 - 2¹ = 1530721232653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530721232653) 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 63 ways as a sum of consecutive naturals, for example, 73769992 + ... + 73790738.

It is an arithmetic number, because the mean of its divisors is an integer number (39340697760).

Almost surely, 2^{1530721232655} is an apocalyptic number.

1530721232655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1530721232655 is a deficient number, since it is larger than the sum of its proper divisors (987083423985).

1530721232655 is a wasteful number, since it uses less digits than its factorization.

1530721232655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21488.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 1530721232655 in words is "one trillion, five hundred thirty billion, seven hundred twenty-one million, two hundred thirty-two thousand, six hundred fifty-five".