1645453403654 has 4 divisors (see below), whose sum is σ = 2468180105484. Its totient is φ = 822726701826.

The previous prime is 1645453403653. The next prime is 1645453403677. The reversal of 1645453403654 is 4563043545461.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645453403653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411363350912 + ... + 411363350915.

It is an arithmetic number, because the mean of its divisors is an integer number (617045026371).

Almost surely, 2^{1645453403654} is an apocalyptic number.

1645453403654 is a deficient number, since it is larger than the sum of its proper divisors (822726701830).

1645453403654 is an equidigital number, since it uses as much as digits as its factorization.

1645453403654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822726701829.

The product of its (nonzero) digits is 10368000, while the sum is 50.

The spelling of 1645453403654 in words is "one trillion, six hundred forty-five billion, four hundred fifty-three million, four hundred three thousand, six hundred fifty-four".