1645516023361 has 4 divisors (see below), whose sum is σ = 1880589740992. Its totient is φ = 1410442305732.

The previous prime is 1645516023353. The next prime is 1645516023379. The reversal of 1645516023361 is 1633206155461.

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 1645516023361 - 2³ = 1645516023353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645516023311) 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, 117536858805 + ... + 117536858818.

It is an arithmetic number, because the mean of its divisors is an integer number (470147435248).

Almost surely, 2^{1645516023361} is an apocalyptic number.

It is an amenable number.

1645516023361 is a deficient number, since it is larger than the sum of its proper divisors (235073717631).

1645516023361 is an equidigital number, since it uses as much as digits as its factorization.

1645516023361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235073717630.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 1645516023361 in words is "one trillion, six hundred forty-five billion, five hundred sixteen million, twenty-three thousand, three hundred sixty-one".