1626721465121 has 4 divisors (see below), whose sum is σ = 1664552196912. Its totient is φ = 1588890733332.

The previous prime is 1626721465093. The next prime is 1626721465153. The reversal of 1626721465121 is 1215641276261.

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 a de Polignac number, because none of the positive numbers 2^k-1626721465121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1626721468121) 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 3 ways as a sum of consecutive naturals, for example, 18915365831 + ... + 18915365916.

It is an arithmetic number, because the mean of its divisors is an integer number (416138049228).

Almost surely, 2^{1626721465121} is an apocalyptic number.

It is an amenable number.

1626721465121 is a deficient number, since it is larger than the sum of its proper divisors (37830731791).

1626721465121 is an equidigital number, since it uses as much as digits as its factorization.

1626721465121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37830731790.

The product of its digits is 241920, while the sum is 44.

The spelling of 1626721465121 in words is "one trillion, six hundred twenty-six billion, seven hundred twenty-one million, four hundred sixty-five thousand, one hundred twenty-one".