621145666036530 has 128 divisors (see below), whose sum is σ = 1801223680700160. Its totient is φ = 151681994081280.

The previous prime is 621145666036517. The next prime is 621145666036543. The reversal of 621145666036530 is 35630666541126.

It is an interprime number because it is at equal distance from previous prime (621145666036517) and next prime (621145666036543).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1828557916 + ... + 1828897575.

It is an arithmetic number, because the mean of its divisors is an integer number (14072060005470).

Almost surely, 2^{621145666036530} is an apocalyptic number.

621145666036530 is an abundant number, since it is smaller than the sum of its proper divisors (1180078014663630).

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

621145666036530 is a wasteful number, since it uses less digits than its factorization.

621145666036530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657455561 (or 3657455555 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 621145666036530 in words is "six hundred twenty-one trillion, one hundred forty-five billion, six hundred sixty-six million, thirty-six thousand, five hundred thirty".