1621513561632 has 96 divisors (see below), whose sum is σ = 4301233763904. Its totient is φ = 534822912000.

The previous prime is 1621513561607. The next prime is 1621513561669. The reversal of 1621513561632 is 2361653151261.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54469632 + ... + 54499392.

It is an arithmetic number, because the mean of its divisors is an integer number (44804518374).

Almost surely, 2^{1621513561632} is an apocalyptic number.

1621513561632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621513561632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2150616881952).

1621513561632 is an abundant number, since it is smaller than the sum of its proper divisors (2679720202272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621513561632 is a wasteful number, since it uses less digits than its factorization.

1621513561632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35722 (or 35714 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The spelling of 1621513561632 in words is "one trillion, six hundred twenty-one billion, five hundred thirteen million, five hundred sixty-one thousand, six hundred thirty-two".