445745018877621 has 4 divisors (see below), whose sum is σ = 594326691836832. Its totient is φ = 297163345918412.

The previous prime is 445745018877617. The next prime is 445745018877677. The reversal of 445745018877621 is 126778810547544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 445745018877621 - 2² = 445745018877617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445745018873621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74290836479601 + ... + 74290836479606.

It is an arithmetic number, because the mean of its divisors is an integer number (148581672959208).

Almost surely, 2^{445745018877621} is an apocalyptic number.

It is an amenable number.

445745018877621 is a deficient number, since it is larger than the sum of its proper divisors (148581672959211).

445745018877621 is a wasteful number, since it uses less digits than its factorization.

445745018877621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148581672959210.

The product of its (nonzero) digits is 421478400, while the sum is 69.

The spelling of 445745018877621 in words is "four hundred forty-five trillion, seven hundred forty-five billion, eighteen million, eight hundred seventy-seven thousand, six hundred twenty-one".