1645610623763 has 4 divisors (see below), whose sum is σ = 1650325840800. Its totient is φ = 1640895406728.

The previous prime is 1645610623753. The next prime is 1645610623781. The reversal of 1645610623763 is 3673260165461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645610623763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645610623753) 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, 2357607995 + ... + 2357608692.

It is an arithmetic number, because the mean of its divisors is an integer number (412581460200).

Almost surely, 2^{1645610623763} is an apocalyptic number.

1645610623763 is a deficient number, since it is larger than the sum of its proper divisors (4715217037).

1645610623763 is an equidigital number, since it uses as much as digits as its factorization.

1645610623763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4715217036.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The spelling of 1645610623763 in words is "one trillion, six hundred forty-five billion, six hundred ten million, six hundred twenty-three thousand, seven hundred sixty-three".