15621621645541 has 16 divisors (see below), whose sum is σ = 15878589382656. Its totient is φ = 15365359609776.

The previous prime is 15621621645527. The next prime is 15621621645551. The reversal of 15621621645541 is 14554612612651.

It is a cyclic number.

It is not a de Polignac number, because 15621621645541 - 2⁹ = 15621621645029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15621621645521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528331740 + ... + 528361306.

It is an arithmetic number, because the mean of its divisors is an integer number (992411836416).

Almost surely, 2^{15621621645541} is an apocalyptic number.

It is an amenable number.

15621621645541 is a deficient number, since it is larger than the sum of its proper divisors (256967737115).

15621621645541 is a wasteful number, since it uses less digits than its factorization.

15621621645541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41208.

The product of its digits is 1728000, while the sum is 49.

The spelling of 15621621645541 in words is "fifteen trillion, six hundred twenty-one billion, six hundred twenty-one million, six hundred forty-five thousand, five hundred forty-one".